51604635555 has 24 divisors (see below), whose sum is σ = 97579675440. Its totient is φ = 25020429120.

The previous prime is 51604635517. The next prime is 51604635559. The reversal of 51604635555 is 55553640615.

51604635555 is a `hidden beast` number, since 5 + 1 + 6 + 0 + 4 + 635 + 5 + 5 + 5 = 666.

It is not a de Polignac number, because 51604635555 - 2¹² = 51604631459 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 51604635555.

It is not an unprimeable number, because it can be changed into a prime (51604635559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52125400 + ... + 52126389.

It is an arithmetic number, because the mean of its divisors is an integer number (4065819810).

Almost surely, 2^51604635555 is an apocalyptic number.

51604635555 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51604635555 is a deficient number, since it is larger than the sum of its proper divisors (45975039885).

51604635555 is a wasteful number, since it uses less digits than its factorization.

51604635555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104251811 (or 104251808 counting only the distinct ones).

The product of its (nonzero) digits is 1350000, while the sum is 45.

The spelling of 51604635555 in words is "fifty-one billion, six hundred four million, six hundred thirty-five thousand, five hundred fifty-five".