51717306311720 has 128 divisors (see below), whose sum is σ = 136336679539200. Its totient is φ = 17285743104000.

The previous prime is 51717306311707. The next prime is 51717306311731. The reversal of 51717306311720 is 2711360371715.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13050245 + ... + 16545195.

It is an arithmetic number, because the mean of its divisors is an integer number (1065130308900).

Almost surely, 2^{51717306311720} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51717306311720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68168339769600).

51717306311720 is an abundant number, since it is smaller than the sum of its proper divisors (84619373227480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51717306311720 is a wasteful number, since it uses less digits than its factorization.

51717306311720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3496299 (or 3496295 counting only the distinct ones).

The product of its (nonzero) digits is 185220, while the sum is 44.

The spelling of 51717306311720 in words is "fifty-one trillion, seven hundred seventeen billion, three hundred six million, three hundred eleven thousand, seven hundred twenty".