15561464504005 has 24 divisors (see below), whose sum is σ = 21723227739288. Its totient is φ = 10670377794048.

The previous prime is 15561464503951. The next prime is 15561464504021. The reversal of 15561464504005 is 50040546416551.

It can be written as a sum of positive squares in 4 ways, for example, as 1999752343876 + 13561712160129 = 1414126^2 + 3682623^2 .

It is not a de Polignac number, because 15561464504005 - 2⁹ = 15561464503493 is a prime.

It is a super-2 number, since 2×15561464504005² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6797017 + ... + 8793313.

It is an arithmetic number, because the mean of its divisors is an integer number (905134489137).

Almost surely, 2^{15561464504005} is an apocalyptic number.

It is an amenable number.

15561464504005 is a deficient number, since it is larger than the sum of its proper divisors (6161763235283).

15561464504005 is a wasteful number, since it uses less digits than its factorization.

15561464504005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2028133 (or 2028126 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 46.

The spelling of 15561464504005 in words is "fifteen trillion, five hundred sixty-one billion, four hundred sixty-four million, five hundred four thousand, five".