51707155221 has 12 divisors (see below), whose sum is σ = 77454339872. Its totient is φ = 34471436652.

The previous prime is 51707155169. The next prime is 51707155277. The reversal of 51707155221 is 12255170715.

51707155221 is a `hidden beast` number, since 5 + 17 + 0 + 71 + 552 + 21 = 666.

It is not a de Polignac number, because 51707155221 - 2²² = 51702960917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51707153221) 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 11 ways as a sum of consecutive naturals, for example, 106393081 + ... + 106393566.

Almost surely, 2^51707155221 is an apocalyptic number.

It is an amenable number.

51707155221 is a deficient number, since it is larger than the sum of its proper divisors (25747184651).

51707155221 is an equidigital number, since it uses as much as digits as its factorization.

51707155221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212786662 (or 212786650 counting only the distinct ones).

The product of its (nonzero) digits is 24500, while the sum is 36.

The spelling of 51707155221 in words is "fifty-one billion, seven hundred seven million, one hundred fifty-five thousand, two hundred twenty-one".