51399876957 has 128 divisors (see below), whose sum is σ = 87267704832. Its totient is φ = 26451532800.

The previous prime is 51399876937. The next prime is 51399876971. The reversal of 51399876957 is 75967899315.

It is not a de Polignac number, because 51399876957 - 2¹⁴ = 51399860573 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a junction number, because it is equal to n+sod(n) for n = 51399876891 and 51399876900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51399876917) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 60257343 + ... + 60258195.

It is an arithmetic number, because the mean of its divisors is an integer number (681778944).

Almost surely, 2^51399876957 is an apocalyptic number.

It is an amenable number.

51399876957 is a deficient number, since it is larger than the sum of its proper divisors (35867827875).

51399876957 is a wasteful number, since it uses less digits than its factorization.

51399876957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131.

The product of its digits is 128595600, while the sum is 69.

The spelling of 51399876957 in words is "fifty-one billion, three hundred ninety-nine million, eight hundred seventy-six thousand, nine hundred fifty-seven".