51439925379 has 4 divisors (see below), whose sum is σ = 68586567176. Its totient is φ = 34293283584.

The previous prime is 51439925363. The next prime is 51439925387. The reversal of 51439925379 is 97352993415.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51439925379 - 2⁴ = 51439925363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51439925309) 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, 8573320894 + ... + 8573320899.

It is an arithmetic number, because the mean of its divisors is an integer number (17146641794).

Almost surely, 2^51439925379 is an apocalyptic number.

51439925379 is a deficient number, since it is larger than the sum of its proper divisors (17146641797).

51439925379 is a wasteful number, since it uses less digits than its factorization.

51439925379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17146641796.

The product of its digits is 9185400, while the sum is 57.

The spelling of 51439925379 in words is "fifty-one billion, four hundred thirty-nine million, nine hundred twenty-five thousand, three hundred seventy-nine".