51372391394 has 8 divisors (see below), whose sum is σ = 77074191360. Its totient is φ = 25680994276.

The previous prime is 51372391391. The next prime is 51372391403. The reversal of 51372391394 is 49319327315.

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

It is not an unprimeable number, because it can be changed into a prime (51372391391) 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, 2588354 + ... + 2608125.

It is an arithmetic number, because the mean of its divisors is an integer number (9634273920).

Almost surely, 2^51372391394 is an apocalyptic number.

51372391394 is a deficient number, since it is larger than the sum of its proper divisors (25701799966).

51372391394 is a wasteful number, since it uses less digits than its factorization.

51372391394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5201424.

The product of its digits is 612360, while the sum is 47.

The spelling of 51372391394 in words is "fifty-one billion, three hundred seventy-two million, three hundred ninety-one thousand, three hundred ninety-four".