15565565056009 has 16 divisors (see below), whose sum is σ = 16158059366400. Its totient is φ = 14976792515776.

The previous prime is 15565565056007. The next prime is 15565565056021. The reversal of 15565565056009 is 90065056556551.

It is a cyclic number.

It is not a de Polignac number, because 15565565056009 - 2¹ = 15565565056007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15565565056007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264048792 + ... + 264107734.

It is an arithmetic number, because the mean of its divisors is an integer number (1009878710400).

Almost surely, 2^{15565565056009} is an apocalyptic number.

It is an amenable number.

15565565056009 is a deficient number, since it is larger than the sum of its proper divisors (592494310391).

15565565056009 is a wasteful number, since it uses less digits than its factorization.

15565565056009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90344.

The product of its (nonzero) digits is 30375000, while the sum is 58.

The spelling of 15565565056009 in words is "fifteen trillion, five hundred sixty-five billion, five hundred sixty-five million, fifty-six thousand, nine".