51656601610161 has 64 divisors (see below), whose sum is σ = 78294689510400. Its totient is φ = 33651326966400.

The previous prime is 51656601610153. The next prime is 51656601610199. The reversal of 51656601610161 is 16101610665615.

51656601610161 is a `hidden beast` number, since 5 + 1 + 6 + 566 + 0 + 16 + 10 + 1 + 61 = 666.

It is not a de Polignac number, because 51656601610161 - 2³ = 51656601610153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51656601620161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 611126581 + ... + 611211101.

It is an arithmetic number, because the mean of its divisors is an integer number (1223354523600).

Almost surely, 2^{51656601610161} is an apocalyptic number.

It is an amenable number.

51656601610161 is a deficient number, since it is larger than the sum of its proper divisors (26638087900239).

51656601610161 is a wasteful number, since it uses less digits than its factorization.

51656601610161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87307 (or 87301 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 51656601610161 in words is "fifty-one trillion, six hundred fifty-six billion, six hundred one million, six hundred ten thousand, one hundred sixty-one".