51513511264 has 24 divisors (see below), whose sum is σ = 103890818808. Its totient is φ = 25128541440.

The previous prime is 51513511243. The next prime is 51513511267. The reversal of 51513511264 is 46211531515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51513511267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19630362 + ... + 19632985.

It is an arithmetic number, because the mean of its divisors is an integer number (4328784117).

Almost surely, 2^51513511264 is an apocalyptic number.

It is an amenable number.

51513511264 is an abundant number, since it is smaller than the sum of its proper divisors (52377307544).

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

51513511264 is a wasteful number, since it uses less digits than its factorization.

51513511264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39263398 (or 39263390 counting only the distinct ones).

The product of its digits is 18000, while the sum is 34.

The spelling of 51513511264 in words is "fifty-one billion, five hundred thirteen million, five hundred eleven thousand, two hundred sixty-four".