51116615556 has 24 divisors (see below), whose sum is σ = 119354230464. Its totient is φ = 17027139360.

The previous prime is 51116615549. The next prime is 51116615567. The reversal of 51116615556 is 65551661115.

It is a super-2 number, since 2×51116615556² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1448400 + ... + 1483271.

It is an arithmetic number, because the mean of its divisors is an integer number (4973092936).

Almost surely, 2^51116615556 is an apocalyptic number.

It is an amenable number.

51116615556 is an abundant number, since it is smaller than the sum of its proper divisors (68237614908).

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

51116615556 is a wasteful number, since it uses less digits than its factorization.

51116615556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2933131 (or 2933129 counting only the distinct ones).

The product of its digits is 135000, while the sum is 42.

The spelling of 51116615556 in words is "fifty-one billion, one hundred sixteen million, six hundred fifteen thousand, five hundred fifty-six".