51164065405 has 16 divisors (see below), whose sum is σ = 62085870000. Its totient is φ = 40472985600.

The previous prime is 51164065399. The next prime is 51164065417. The reversal of 51164065405 is 50456046115.

It can be written as a sum of positive squares in 8 ways, for example, as 165328164 + 50998737241 = 12858^2 + 225829^2 .

It is not a de Polignac number, because 51164065405 - 2⁵ = 51164065373 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322471 + ... + 454219.

It is an arithmetic number, because the mean of its divisors is an integer number (3880366875).

Almost surely, 2^51164065405 is an apocalyptic number.

It is an amenable number.

51164065405 is a deficient number, since it is larger than the sum of its proper divisors (10921804595).

51164065405 is a wasteful number, since it uses less digits than its factorization.

51164065405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132624.

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 51164065405 in words is "fifty-one billion, one hundred sixty-four million, sixty-five thousand, four hundred five".