51106656656665 has 16 divisors (see below), whose sum is σ = 61661429758656. Its totient is φ = 40663502280000.

The previous prime is 51106656656567. The next prime is 51106656656669. The reversal of 51106656656665 is 56665665660115.

It is not a de Polignac number, because 51106656656665 - 2²³ = 51106648268057 is a prime.

It is a super-2 number, since 2×51106656656665² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51106656656597 and 51106656656606.

It is not an unprimeable number, because it can be changed into a prime (51106656656669) 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, 28599102 + ... + 30333511.

It is an arithmetic number, because the mean of its divisors is an integer number (3853839359916).

Almost surely, 2^{51106656656665} is an apocalyptic number.

It is an amenable number.

51106656656665 is a deficient number, since it is larger than the sum of its proper divisors (10554773101991).

51106656656665 is a wasteful number, since it uses less digits than its factorization.

51106656656665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58933560.

The product of its (nonzero) digits is 174960000, while the sum is 64.

The spelling of 51106656656665 in words is "fifty-one trillion, one hundred six billion, six hundred fifty-six million, six hundred fifty-six thousand, six hundred sixty-five".