5156611611561 has 16 divisors (see below), whose sum is σ = 7639879173120. Its totient is φ = 3437536520880.

The previous prime is 5156611611533. The next prime is 5156611611589. The reversal of 5156611611561 is 1651161166515.

5156611611561 is a `hidden beast` number, since 5 + 1 + 5 + 6 + 61 + 16 + 11 + 561 = 666.

It is an interprime number because it is at equal distance from previous prime (5156611611533) and next prime (5156611611589).

It is not a de Polignac number, because 5156611611561 - 2¹⁰ = 5156611610537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5156611611521) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5219190 + ... + 6128063.

It is an arithmetic number, because the mean of its divisors is an integer number (477492448320).

Almost surely, 2^{5156611611561} is an apocalyptic number.

It is an amenable number.

5156611611561 is a deficient number, since it is larger than the sum of its proper divisors (2483267561559).

5156611611561 is a wasteful number, since it uses less digits than its factorization.

5156611611561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11364093 (or 11364087 counting only the distinct ones).

The product of its digits is 162000, while the sum is 45.

The spelling of 5156611611561 in words is "five trillion, one hundred fifty-six billion, six hundred eleven million, six hundred eleven thousand, five hundred sixty-one".