5544121581 has 12 divisors (see below), whose sum is σ = 8009068860. Its totient is φ = 3695668800.

The previous prime is 5544121577. The next prime is 5544121591. The reversal of 5544121581 is 1851214455.

5544121581 is a `hidden beast` number, since 5 + 54 + 4 + 1 + 21 + 581 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2884656681 + 2659464900 = 53709^2 + 51570^2 .

It is not a de Polignac number, because 5544121581 - 2² = 5544121577 is a prime.

It is a super-2 number, since 2×5544121581² = 61474568209819879122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5544121501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66355 + ... + 124463.

It is an arithmetic number, because the mean of its divisors is an integer number (667422405).

Almost surely, 2^5544121581 is an apocalyptic number.

It is an amenable number.

5544121581 is a deficient number, since it is larger than the sum of its proper divisors (2464947279).

5544121581 is a wasteful number, since it uses less digits than its factorization.

5544121581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68716 (or 68713 counting only the distinct ones).

The product of its digits is 32000, while the sum is 36.

The square root of 5544121581 is about 74458.8583111506. The cubic root of 5544121581 is about 1769.8817396809.

The spelling of 5544121581 in words is "five billion, five hundred forty-four million, one hundred twenty-one thousand, five hundred eighty-one".