51507091715 has 4 divisors (see below), whose sum is σ = 61808510064. Its totient is φ = 41205673368.

The previous prime is 51507091679. The next prime is 51507091717. The reversal of 51507091715 is 51719070515.

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 51507091715 - 2⁸ = 51507091459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51507091717) 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, 5150709167 + ... + 5150709176.

It is an arithmetic number, because the mean of its divisors is an integer number (15452127516).

Almost surely, 2^51507091715 is an apocalyptic number.

51507091715 is a deficient number, since it is larger than the sum of its proper divisors (10301418349).

51507091715 is a wasteful number, since it uses less digits than its factorization.

51507091715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10301418348.

The product of its (nonzero) digits is 55125, while the sum is 41.

The spelling of 51507091715 in words is "fifty-one billion, five hundred seven million, ninety-one thousand, seven hundred fifteen".