51439715805 has 16 divisors (see below), whose sum is σ = 82318224960. Its totient is φ = 27429621888.

The previous prime is 51439715783. The next prime is 51439715807. The reversal of 51439715805 is 50851793415.

It is not a de Polignac number, because 51439715805 - 2⁸ = 51439715549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51439715807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218112 + ... + 387881.

It is an arithmetic number, because the mean of its divisors is an integer number (5144889060).

Almost surely, 2^51439715805 is an apocalyptic number.

It is an amenable number.

51439715805 is a deficient number, since it is larger than the sum of its proper divisors (30878509155).

51439715805 is a wasteful number, since it uses less digits than its factorization.

51439715805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611660.

The product of its (nonzero) digits is 756000, while the sum is 48.

The spelling of 51439715805 in words is "fifty-one billion, four hundred thirty-nine million, seven hundred fifteen thousand, eight hundred five".