51787678715 has 32 divisors (see below), whose sum is σ = 67114244736. Its totient is φ = 38263357440.

The previous prime is 51787678699. The next prime is 51787678717.

51787678715 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51787678715 - 2⁴ = 51787678699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51787678717) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 400739 + ... + 513971.

It is an arithmetic number, because the mean of its divisors is an integer number (2097320148).

Almost surely, 2^51787678715 is an apocalyptic number.

51787678715 is a deficient number, since it is larger than the sum of its proper divisors (15326566021).

51787678715 is a wasteful number, since it uses less digits than its factorization.

51787678715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113399.

The product of its digits is 23049600, while the sum is 62.

The spelling of 51787678715 in words is "fifty-one billion, seven hundred eighty-seven million, six hundred seventy-eight thousand, seven hundred fifteen".