51031664171 has 2 divisors, whose sum is σ = 51031664172. Its totient is φ = 51031664170.

The previous prime is 51031664137. The next prime is 51031664231. The reversal of 51031664171 is 17146613015.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51031664171 - 2¹⁰ = 51031663147 is a prime.

It is not a weakly prime, because it can be changed into another prime (51034664171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25515832085 + 25515832086.

It is an arithmetic number, because the mean of its divisors is an integer number (25515832086).

Almost surely, 2^51031664171 is an apocalyptic number.

51031664171 is a deficient number, since it is larger than the sum of its proper divisors (1).

51031664171 is an equidigital number, since it uses as much as digits as its factorization.

51031664171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 51031664171 in words is "fifty-one billion, thirty-one million, six hundred sixty-four thousand, one hundred seventy-one".