51393212639 has 16 divisors (see below), whose sum is σ = 55141416960. Its totient is φ = 47808053280.

The previous prime is 51393212617. The next prime is 51393212653. The reversal of 51393212639 is 93621239315.

It is a cyclic number.

It is not a de Polignac number, because 51393212639 - 2⁸ = 51393212383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51393212639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51393242639) 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, 174719 + ... + 365120.

It is an arithmetic number, because the mean of its divisors is an integer number (3446338560).

Almost surely, 2^51393212639 is an apocalyptic number.

51393212639 is a deficient number, since it is larger than the sum of its proper divisors (3748204321).

51393212639 is a wasteful number, since it uses less digits than its factorization.

51393212639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539990.

The product of its digits is 262440, while the sum is 44.

The spelling of 51393212639 in words is "fifty-one billion, three hundred ninety-three million, two hundred twelve thousand, six hundred thirty-nine".