51486379928813 has 2 divisors, whose sum is σ = 51486379928814. Its totient is φ = 51486379928812.

The previous prime is 51486379928771. The next prime is 51486379928843. The reversal of 51486379928813 is 31882997368415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43123623992164 + 8362755936649 = 6566858^2 + 2891843^2 .

It is a cyclic number.

It is not a de Polignac number, because 51486379928813 - 2²² = 51486375734509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51486379928843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25743189964406 + 25743189964407.

It is an arithmetic number, because the mean of its divisors is an integer number (25743189964407).

Almost surely, 2^{51486379928813} is an apocalyptic number.

It is an amenable number.

51486379928813 is a deficient number, since it is larger than the sum of its proper divisors (1).

51486379928813 is an equidigital number, since it uses as much as digits as its factorization.

51486379928813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 627056640, while the sum is 74.

The spelling of 51486379928813 in words is "fifty-one trillion, four hundred eighty-six billion, three hundred seventy-nine million, nine hundred twenty-eight thousand, eight hundred thirteen".