51687920715 has 16 divisors (see below), whose sum is σ = 82758824448. Its totient is φ = 27547507296.

The previous prime is 51687920699. The next prime is 51687920717. The reversal of 51687920715 is 51702978615.

It is not a de Polignac number, because 51687920715 - 2⁴ = 51687920699 is a prime.

It is a super-2 number, since 2×51687920715² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51687920717) 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, 1189429 + ... + 1232118.

It is an arithmetic number, because the mean of its divisors is an integer number (5172426528).

Almost surely, 2^51687920715 is an apocalyptic number.

51687920715 is a deficient number, since it is larger than the sum of its proper divisors (31070903733).

51687920715 is a wasteful number, since it uses less digits than its factorization.

51687920715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422978.

The product of its (nonzero) digits is 1058400, while the sum is 51.

The spelling of 51687920715 in words is "fifty-one billion, six hundred eighty-seven million, nine hundred twenty thousand, seven hundred fifteen".