51505116507 has 18 divisors (see below), whose sum is σ = 80559287172. Its totient is φ = 31695455376.

The previous prime is 51505116449. The next prime is 51505116511. The reversal of 51505116507 is 70561150515.

It is a happy number.

51505116507 is a `hidden beast` number, since 51 + 50 + 51 + 1 + 6 + 507 = 666.

It is not a de Polignac number, because 51505116507 - 2⁷ = 51505116379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51505116517) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16929813 + ... + 16932854.

It is an arithmetic number, because the mean of its divisors is an integer number (4475515954).

Almost surely, 2^51505116507 is an apocalyptic number.

51505116507 is a deficient number, since it is larger than the sum of its proper divisors (29054170665).

51505116507 is a wasteful number, since it uses less digits than its factorization.

51505116507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33862699 (or 33862683 counting only the distinct ones).

The product of its (nonzero) digits is 26250, while the sum is 36.

The spelling of 51505116507 in words is "fifty-one billion, five hundred five million, one hundred sixteen thousand, five hundred seven".