51610163881 has 16 divisors (see below), whose sum is σ = 55858771584. Its totient is φ = 47502284544.

The previous prime is 51610163879. The next prime is 51610163893. The reversal of 51610163881 is 18836101615.

It is not a de Polignac number, because 51610163881 - 2¹ = 51610163879 is a prime.

It is a super-2 number, since 2×51610163881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51610163281) 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, 183316 + ... + 369898.

It is an arithmetic number, because the mean of its divisors is an integer number (3491173224).

Almost surely, 2^51610163881 is an apocalyptic number.

It is an amenable number.

51610163881 is a deficient number, since it is larger than the sum of its proper divisors (4248607703).

51610163881 is a wasteful number, since it uses less digits than its factorization.

51610163881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186960.

The product of its (nonzero) digits is 34560, while the sum is 40.

The spelling of 51610163881 in words is "fifty-one billion, six hundred ten million, one hundred sixty-three thousand, eight hundred eighty-one".