51031664137 has 2 divisors, whose sum is σ = 51031664138. Its totient is φ = 51031664136.

The previous prime is 51031664119. The next prime is 51031664171. The reversal of 51031664137 is 73146613015.

51031664137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49998748816 + 1032915321 = 223604^2 + 32139^2 .

It is a cyclic number.

It is not a de Polignac number, because 51031664137 - 2²⁷ = 50897446409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51031664096 and 51031664105.

It is not a weakly prime, because it can be changed into another prime (51031664837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25515832068 + 25515832069.

It is an arithmetic number, because the mean of its divisors is an integer number (25515832069).

Almost surely, 2^51031664137 is an apocalyptic number.

It is an amenable number.

51031664137 is a deficient number, since it is larger than the sum of its proper divisors (1).

51031664137 is an equidigital number, since it uses as much as digits as its factorization.

51031664137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 51031664137 in words is "fifty-one billion, thirty-one million, six hundred sixty-four thousand, one hundred thirty-seven".