51381344654651 has 8 divisors (see below), whose sum is σ = 56186152545600. Its totient is φ = 46598832856840.

The previous prime is 51381344654639. The next prime is 51381344654681. The reversal of 51381344654651 is 15645644318315.

It is a happy number.

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

It is not a de Polignac number, because 51381344654651 - 2⁶ = 51381344654587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51381344654611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5574018461 + ... + 5574027678.

It is an arithmetic number, because the mean of its divisors is an integer number (7023269068200).

Almost surely, 2^{51381344654651} is an apocalyptic number.

51381344654651 is a deficient number, since it is larger than the sum of its proper divisors (4804807890949).

51381344654651 is a wasteful number, since it uses less digits than its factorization.

51381344654651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11148046569.

The product of its digits is 20736000, while the sum is 56.

The spelling of 51381344654651 in words is "fifty-one trillion, three hundred eighty-one billion, three hundred forty-four million, six hundred fifty-four thousand, six hundred fifty-one".