51516116505 has 64 divisors (see below), whose sum is σ = 104874278400. Its totient is φ = 23503737600.

The previous prime is 51516116489. The next prime is 51516116579. The reversal of 51516116505 is 50561161515.

It is a happy number.

It is not a de Polignac number, because 51516116505 - 2⁴ = 51516116489 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51516116505.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 427455 + ... + 534555.

It is an arithmetic number, because the mean of its divisors is an integer number (1638660600).

Almost surely, 2^51516116505 is an apocalyptic number.

It is an amenable number.

51516116505 is an abundant number, since it is smaller than the sum of its proper divisors (53358161895).

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

51516116505 is a wasteful number, since it uses less digits than its factorization.

51516116505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107631 (or 107625 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 51516116505 in words is "fifty-one billion, five hundred sixteen million, one hundred sixteen thousand, five hundred five".