51656565156 has 96 divisors (see below), whose sum is σ = 139176774912. Its totient is φ = 14606991360.

The previous prime is 51656565151. The next prime is 51656565197. The reversal of 51656565156 is 65156565615.

It is a junction number, because it is equal to n+sod(n) for n = 51656565099 and 51656565108.

It is not an unprimeable number, because it can be changed into a prime (51656565151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3381696 + ... + 3396936.

It is an arithmetic number, because the mean of its divisors is an integer number (1449758072).

Almost surely, 2^51656565156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51656565156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69588387456).

51656565156 is an abundant number, since it is smaller than the sum of its proper divisors (87520209756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51656565156 is a wasteful number, since it uses less digits than its factorization.

51656565156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15669 (or 15667 counting only the distinct ones).

The product of its digits is 4050000, while the sum is 51.

The spelling of 51656565156 in words is "fifty-one billion, six hundred fifty-six million, five hundred sixty-five thousand, one hundred fifty-six".