51375254391 has 6 divisors (see below), whose sum is σ = 74208700800. Its totient is φ = 34250169588.

The previous prime is 51375254389. The next prime is 51375254453. The reversal of 51375254391 is 19345257315.

51375254391 is a `hidden beast` number, since 5 + 1 + 3 + 7 + 5 + 254 + 391 = 666.

It is not a de Polignac number, because 51375254391 - 2¹ = 51375254389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51375254191) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2854180791 + ... + 2854180808.

It is an arithmetic number, because the mean of its divisors is an integer number (12368116800).

Almost surely, 2^51375254391 is an apocalyptic number.

51375254391 is a deficient number, since it is larger than the sum of its proper divisors (22833446409).

51375254391 is a wasteful number, since it uses less digits than its factorization.

51375254391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5708361605 (or 5708361602 counting only the distinct ones).

The product of its digits is 567000, while the sum is 45.

The spelling of 51375254391 in words is "fifty-one billion, three hundred seventy-five million, two hundred fifty-four thousand, three hundred ninety-one".