51501776121 has 12 divisors (see below), whose sum is σ = 76205880660. Its totient is φ = 33497089920.

The previous prime is 51501776119. The next prime is 51501776129. The reversal of 51501776121 is 12167710515.

It is a happy number.

51501776121 is a `hidden beast` number, since 5 + 1 + 501 + 77 + 61 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11176718400 + 40325057721 = 105720^2 + 200811^2 .

It is not a de Polignac number, because 51501776121 - 2¹ = 51501776119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51501776129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69785236 + ... + 69785973.

It is an arithmetic number, because the mean of its divisors is an integer number (6350490055).

Almost surely, 2^51501776121 is an apocalyptic number.

It is an amenable number.

51501776121 is a deficient number, since it is larger than the sum of its proper divisors (24704104539).

51501776121 is a wasteful number, since it uses less digits than its factorization.

51501776121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139571256 (or 139571253 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 36.

The spelling of 51501776121 in words is "fifty-one billion, five hundred one million, seven hundred seventy-six thousand, one hundred twenty-one".