51555053121 has 32 divisors (see below), whose sum is σ = 81590183808. Its totient is φ = 28544624640.

The previous prime is 51555053113. The next prime is 51555053141. The reversal of 51555053121 is 12135055515.

It is not a de Polignac number, because 51555053121 - 2³ = 51555053113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (51555053101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 577846 + ... + 661071.

It is an arithmetic number, because the mean of its divisors is an integer number (2549693244).

Almost surely, 2^51555053121 is an apocalyptic number.

It is an amenable number.

51555053121 is a deficient number, since it is larger than the sum of its proper divisors (30035130687).

51555053121 is a wasteful number, since it uses less digits than its factorization.

51555053121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239041.

The product of its (nonzero) digits is 18750, while the sum is 33.

The spelling of 51555053121 in words is "fifty-one billion, five hundred fifty-five million, fifty-three thousand, one hundred twenty-one".