51431213278 has 16 divisors (see below), whose sum is σ = 81318010320. Its totient is φ = 24328904256.

The previous prime is 51431213257. The next prime is 51431213329. The reversal of 51431213278 is 87231213415.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 895375 + ... + 951082.

It is an arithmetic number, because the mean of its divisors is an integer number (5082375645).

Almost surely, 2^51431213278 is an apocalyptic number.

51431213278 is a deficient number, since it is larger than the sum of its proper divisors (29886797042).

51431213278 is a wasteful number, since it uses less digits than its factorization.

51431213278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847211.

The product of its digits is 40320, while the sum is 37.

The spelling of 51431213278 in words is "fifty-one billion, four hundred thirty-one million, two hundred thirteen thousand, two hundred seventy-eight".