51111656656 has 40 divisors (see below), whose sum is σ = 99507738240. Its totient is φ = 25432382976.

The previous prime is 51111656647. The next prime is 51111656711. The reversal of 51111656656 is 65665611115.

It is a super-2 number, since 2×51111656656² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7656136 + ... + 7662808.

It is an arithmetic number, because the mean of its divisors is an integer number (2487693456).

Almost surely, 2^51111656656 is an apocalyptic number.

It is an amenable number.

51111656656 is a deficient number, since it is larger than the sum of its proper divisors (48396081584).

51111656656 is a wasteful number, since it uses less digits than its factorization.

51111656656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8923 (or 8917 counting only the distinct ones).

The product of its digits is 162000, while the sum is 43.

The spelling of 51111656656 in words is "fifty-one billion, one hundred eleven million, six hundred fifty-six thousand, six hundred fifty-six".