51708342857 has 4 divisors (see below), whose sum is σ = 51759088080. Its totient is φ = 51657597636.

The previous prime is 51708342821. The next prime is 51708342877. The reversal of 51708342857 is 75824380715.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51708342857 - 2²⁶ = 51641233993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51708342877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25371083 + ... + 25373120.

It is an arithmetic number, because the mean of its divisors is an integer number (12939772020).

Almost surely, 2^51708342857 is an apocalyptic number.

It is an amenable number.

51708342857 is a deficient number, since it is larger than the sum of its proper divisors (50745223).

51708342857 is a wasteful number, since it uses less digits than its factorization.

51708342857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50745222.

The product of its (nonzero) digits is 1881600, while the sum is 50.

The spelling of 51708342857 in words is "fifty-one billion, seven hundred eight million, three hundred forty-two thousand, eight hundred fifty-seven".