51516651565556 has 12 divisors (see below), whose sum is σ = 90154330969668. Its totient is φ = 25758271288512.

The previous prime is 51516651565523. The next prime is 51516651565573. The reversal of 51516651565556 is 65556515661515.

It can be written as a sum of positive squares in 2 ways, for example, as 3068508944656 + 48448142620900 = 1751716^2 + 6960470^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 11458271 + ... + 15307686.

It is an arithmetic number, because the mean of its divisors is an integer number (7512860914139).

Almost surely, 2^{51516651565556} is an apocalyptic number.

It is an amenable number.

51516651565556 is a deficient number, since it is larger than the sum of its proper divisors (38637679404112).

51516651565556 is a wasteful number, since it uses less digits than its factorization.

51516651565556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27247138 (or 27247136 counting only the distinct ones).

The product of its digits is 101250000, while the sum is 62.

The spelling of 51516651565556 in words is "fifty-one trillion, five hundred sixteen billion, six hundred fifty-one million, five hundred sixty-five thousand, five hundred fifty-six".