78518646875 has 24 divisors (see below), whose sum is σ = 98183872080. Its totient is φ = 62788140000.

The previous prime is 78518646847. The next prime is 78518646881. The reversal of 78518646875 is 57864681587.

It is not a de Polignac number, because 78518646875 - 2¹² = 78518642779 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10837004 + ... + 10844246.

It is an arithmetic number, because the mean of its divisors is an integer number (4090994670).

Almost surely, 2^78518646875 is an apocalyptic number.

78518646875 is a deficient number, since it is larger than the sum of its proper divisors (19665225205).

78518646875 is an frugal number, since it uses more digits than its factorization.

78518646875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10737 (or 10717 counting only the distinct ones).

The product of its digits is 90316800, while the sum is 65.

The spelling of 78518646875 in words is "seventy-eight billion, five hundred eighteen million, six hundred forty-six thousand, eight hundred seventy-five".