78518718993 has 96 divisors (see below), whose sum is σ = 129849266176. Its totient is φ = 41869872000.

The previous prime is 78518718991. The next prime is 78518718997. The reversal of 78518718993 is 39981781587.

It is not a de Polignac number, because 78518718993 - 2¹ = 78518718991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78518718991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9797358 + ... + 9805368.

Almost surely, 2^78518718993 is an apocalyptic number.

It is an amenable number.

78518718993 is a deficient number, since it is larger than the sum of its proper divisors (51330547183).

78518718993 is a wasteful number, since it uses less digits than its factorization.

78518718993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8147 (or 8136 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 66.

The spelling of 78518718993 in words is "seventy-eight billion, five hundred eighteen million, seven hundred eighteen thousand, nine hundred ninety-three".