78608687591 has 16 divisors (see below), whose sum is σ = 90055655424. Its totient is φ = 67216129344.

The previous prime is 78608687567. The next prime is 78608687603. The reversal of 78608687591 is 19578680687.

It is a happy number.

It is not a de Polignac number, because 78608687591 - 2²² = 78604493287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78608683591) 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 15 ways as a sum of consecutive naturals, for example, 14281946 + ... + 14287448.

It is an arithmetic number, because the mean of its divisors is an integer number (5628478464).

Almost surely, 2^78608687591 is an apocalyptic number.

78608687591 is a deficient number, since it is larger than the sum of its proper divisors (11446967833).

78608687591 is a wasteful number, since it uses less digits than its factorization.

78608687591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10070.

The product of its (nonzero) digits is 40642560, while the sum is 65.

The spelling of 78608687591 in words is "seventy-eight billion, six hundred eight million, six hundred eighty-seven thousand, five hundred ninety-one".