15561116505051 has 16 divisors (see below), whose sum is σ = 22440065016096. Its totient is φ = 9534972669696.

The previous prime is 15561116505047. The next prime is 15561116505059. The reversal of 15561116505051 is 15050561116551.

It is not a de Polignac number, because 15561116505051 - 2² = 15561116505047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15561116504994 and 15561116505012.

It is not an unprimeable number, because it can be changed into a prime (15561116505059) 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, 856220500 + ... + 856238673.

It is an arithmetic number, because the mean of its divisors is an integer number (1402504063506).

Almost surely, 2^{15561116505051} is an apocalyptic number.

15561116505051 is a deficient number, since it is larger than the sum of its proper divisors (6878948511045).

15561116505051 is a wasteful number, since it uses less digits than its factorization.

15561116505051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712459422.

The product of its (nonzero) digits is 112500, while the sum is 42.

The spelling of 15561116505051 in words is "fifteen trillion, five hundred sixty-one billion, one hundred sixteen million, five hundred five thousand, fifty-one".