51439327679 has 4 divisors (see below), whose sum is σ = 51442222320. Its totient is φ = 51436433040.

The previous prime is 51439327673. The next prime is 51439327691. The reversal of 51439327679 is 97672393415.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51439327679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51439327673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1420499 + ... + 1456260.

It is an arithmetic number, because the mean of its divisors is an integer number (12860555580).

Almost surely, 2^51439327679 is an apocalyptic number.

51439327679 is a deficient number, since it is larger than the sum of its proper divisors (2894641).

51439327679 is a wasteful number, since it uses less digits than its factorization.

51439327679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2894640.

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

The spelling of 51439327679 in words is "fifty-one billion, four hundred thirty-nine million, three hundred twenty-seven thousand, six hundred seventy-nine".