78256668917 has 8 divisors (see below), whose sum is σ = 89494167936. Its totient is φ = 67033663632.

The previous prime is 78256668911. The next prime is 78256668929. The reversal of 78256668917 is 71986665287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78256668917 - 2⁴ = 78256668901 is a prime.

It is a super-2 number, since 2×78256668917² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78256668911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3611858 + ... + 3633459.

It is an arithmetic number, because the mean of its divisors is an integer number (11186770992).

Almost surely, 2^78256668917 is an apocalyptic number.

It is an amenable number.

78256668917 is a deficient number, since it is larger than the sum of its proper divisors (11237499019).

78256668917 is a wasteful number, since it uses less digits than its factorization.

78256668917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7246867.

The product of its digits is 60963840, while the sum is 65.

The spelling of 78256668917 in words is "seventy-eight billion, two hundred fifty-six million, six hundred sixty-eight thousand, nine hundred seventeen".