78424717985 has 16 divisors (see below), whose sum is σ = 99723571200. Its totient is φ = 59002949376.

The previous prime is 78424717979. The next prime is 78424717999. The reversal of 78424717985 is 58971742487.

It is not a de Polignac number, because 78424717985 - 2¹⁴ = 78424701601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251975 + ... + 469404.

It is an arithmetic number, because the mean of its divisors is an integer number (6232723200).

Almost surely, 2^78424717985 is an apocalyptic number.

It is an amenable number.

78424717985 is a deficient number, since it is larger than the sum of its proper divisors (21298853215).

78424717985 is a wasteful number, since it uses less digits than its factorization.

78424717985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722680.

The product of its digits is 31610880, while the sum is 62.

The spelling of 78424717985 in words is "seventy-eight billion, four hundred twenty-four million, seven hundred seventeen thousand, nine hundred eighty-five".