51713665465 has 48 divisors (see below), whose sum is σ = 78087453696. Its totient is φ = 32182381440.

The previous prime is 51713665417. The next prime is 51713665477. The reversal of 51713665465 is 56456631715.

It is a de Polignac number, because none of the positive numbers 2^k-51713665465 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2560587 + ... + 2580703.

It is an arithmetic number, because the mean of its divisors is an integer number (1626821952).

Almost surely, 2^51713665465 is an apocalyptic number.

51713665465 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51713665465 is a deficient number, since it is larger than the sum of its proper divisors (26373788231).

51713665465 is a wasteful number, since it uses less digits than its factorization.

51713665465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20758 (or 20747 counting only the distinct ones).

The product of its digits is 2268000, while the sum is 49.

The spelling of 51713665465 in words is "fifty-one billion, seven hundred thirteen million, six hundred sixty-five thousand, four hundred sixty-five".