51191564857 has 8 divisors (see below), whose sum is σ = 55356086016. Its totient is φ = 47155182912.

The previous prime is 51191564839. The next prime is 51191564909. The reversal of 51191564857 is 75846519115.

51191564857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51191564857 - 2⁷ = 51191564729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51191564657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32033973 + ... + 32035570.

It is an arithmetic number, because the mean of its divisors is an integer number (6919510752).

Almost surely, 2^51191564857 is an apocalyptic number.

It is an amenable number.

51191564857 is a deficient number, since it is larger than the sum of its proper divisors (4164521159).

51191564857 is a wasteful number, since it uses less digits than its factorization.

51191564857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64069607.

The product of its digits is 1512000, while the sum is 52.

The spelling of 51191564857 in words is "fifty-one billion, one hundred ninety-one million, five hundred sixty-four thousand, eight hundred fifty-seven".