51561802135 has 8 divisors (see below), whose sum is σ = 62216009856. Its totient is φ = 41021543520.

The previous prime is 51561802129. The next prime is 51561802151. The reversal of 51561802135 is 53120816515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-51561802135 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51561802094 and 51561802103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28486279 + ... + 28488088.

It is an arithmetic number, because the mean of its divisors is an integer number (7777001232).

Almost surely, 2^51561802135 is an apocalyptic number.

51561802135 is a deficient number, since it is larger than the sum of its proper divisors (10654207721).

51561802135 is a wasteful number, since it uses less digits than its factorization.

51561802135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56974553.

The product of its (nonzero) digits is 36000, while the sum is 37.

The spelling of 51561802135 in words is "fifty-one billion, five hundred sixty-one million, eight hundred two thousand, one hundred thirty-five".