51249845857 has 16 divisors (see below), whose sum is σ = 59153935360. Its totient is φ = 43491630672.

The previous prime is 51249845851. The next prime is 51249845861. The reversal of 51249845857 is 75854894215.

It is not a de Polignac number, because 51249845857 - 2³ = 51249845849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51249845851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6065878 + ... + 6074320.

It is an arithmetic number, because the mean of its divisors is an integer number (3697120960).

Almost surely, 2^51249845857 is an apocalyptic number.

It is an amenable number.

51249845857 is a deficient number, since it is larger than the sum of its proper divisors (7904089503).

51249845857 is a wasteful number, since it uses less digits than its factorization.

51249845857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16972.

The product of its digits is 16128000, while the sum is 58.

The spelling of 51249845857 in words is "fifty-one billion, two hundred forty-nine million, eight hundred forty-five thousand, eight hundred fifty-seven".