6541988445 has 12 divisors (see below), whose sum is σ = 11339446716. Its totient is φ = 3489060480.

The previous prime is 6541988443. The next prime is 6541988447. The reversal of 6541988445 is 5448891456.

6541988445 is a `hidden beast` number, since 6 + 5 + 4 + 198 + 8 + 445 = 666.

6541988445 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (6541988443) and next prime (6541988447).

It can be written as a sum of positive squares in 2 ways, for example, as 3568031289 + 2973957156 = 59733^2 + 54534^2 .

It is not a de Polignac number, because 6541988445 - 2¹ = 6541988443 is a prime.

It is a super-2 number, since 2×6541988445² = 85595225629027036050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6541988391 and 6541988400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6541988441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72688716 + ... + 72688805.

It is an arithmetic number, because the mean of its divisors is an integer number (944953893).

Almost surely, 2^6541988445 is an apocalyptic number.

It is an amenable number.

6541988445 is a deficient number, since it is larger than the sum of its proper divisors (4797458271).

6541988445 is a wasteful number, since it uses less digits than its factorization.

6541988445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145377532 (or 145377529 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 54.

The square root of 6541988445 is about 80882.5595848697. The cubic root of 6541988445 is about 1870.2654779563.

The spelling of 6541988445 in words is "six billion, five hundred forty-one million, nine hundred eighty-eight thousand, four hundred forty-five".