51716806257 has 4 divisors (see below), whose sum is σ = 68955741680. Its totient is φ = 34477870836.

The previous prime is 51716806181. The next prime is 51716806261. The reversal of 51716806257 is 75260861715.

51716806257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 51716806257 - 2¹⁶ = 51716740721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51716804257) 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, 8619467707 + ... + 8619467712.

It is an arithmetic number, because the mean of its divisors is an integer number (17238935420).

Almost surely, 2^51716806257 is an apocalyptic number.

It is an amenable number.

51716806257 is a deficient number, since it is larger than the sum of its proper divisors (17238935423).

51716806257 is a wasteful number, since it uses less digits than its factorization.

51716806257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17238935422.

The product of its (nonzero) digits is 705600, while the sum is 48.

The spelling of 51716806257 in words is "fifty-one billion, seven hundred sixteen million, eight hundred six thousand, two hundred fifty-seven".