6645435201556 has 12 divisors (see below), whose sum is σ = 11629530943380. Its totient is φ = 3322712074880.

The previous prime is 6645435201547. The next prime is 6645435201617. The reversal of 6645435201556 is 6551025345466.

It can be written as a sum of positive squares in 2 ways, for example, as 6557799072400 + 87636129156 = 2560820^2 + 296034^2 .

It is a super-2 number, since 2×6645435201556² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2598186 + ... + 4476766.

It is an arithmetic number, because the mean of its divisors is an integer number (969127578615).

Almost surely, 2^{6645435201556} is an apocalyptic number.

It is an amenable number.

6645435201556 is a deficient number, since it is larger than the sum of its proper divisors (4984095741824).

6645435201556 is a wasteful number, since it uses less digits than its factorization.

6645435201556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2762954 (or 2762952 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 52.

The spelling of 6645435201556 in words is "six trillion, six hundred forty-five billion, four hundred thirty-five million, two hundred one thousand, five hundred fifty-six".