51605313536 has 72 divisors (see below), whose sum is σ = 120032263260. Its totient is φ = 22116519936.

The previous prime is 51605313499. The next prime is 51605313547. The reversal of 51605313536 is 63531350615.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 51605313536.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 156770 + ... + 357473.

Almost surely, 2^51605313536 is an apocalyptic number.

51605313536 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51605313536 is an abundant number, since it is smaller than the sum of its proper divisors (68426949724).

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

51605313536 is an equidigital number, since it uses as much as digits as its factorization.

51605313536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514279 (or 514252 counting only the distinct ones).

The product of its (nonzero) digits is 121500, while the sum is 38.

The spelling of 51605313536 in words is "fifty-one billion, six hundred five million, three hundred thirteen thousand, five hundred thirty-six".