51342637979 has 4 divisors (see below), whose sum is σ = 51480286176. Its totient is φ = 51204989784.

The previous prime is 51342637963. The next prime is 51342637981. The reversal of 51342637979 is 97973624315.

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

It is a cyclic number.

It is not a de Polignac number, because 51342637979 - 2⁴ = 51342637963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51342637909) 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, 68823539 + ... + 68824284.

It is an arithmetic number, because the mean of its divisors is an integer number (12870071544).

Almost surely, 2^51342637979 is an apocalyptic number.

51342637979 is a deficient number, since it is larger than the sum of its proper divisors (137648197).

51342637979 is a wasteful number, since it uses less digits than its factorization.

51342637979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137648196.

The product of its digits is 8573040, while the sum is 56.

The spelling of 51342637979 in words is "fifty-one billion, three hundred forty-two million, six hundred thirty-seven thousand, nine hundred seventy-nine".