78686266231 has 4 divisors (see below), whose sum is σ = 78878653600. Its totient is φ = 78493878864.

The previous prime is 78686266193. The next prime is 78686266247. The reversal of 78686266231 is 13266268687.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78686266231 - 2¹³ = 78686258039 is a prime.

It is a super-2 number, since 2×78686266231² (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 (78686266261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96193071 + ... + 96193888.

It is an arithmetic number, because the mean of its divisors is an integer number (19719663400).

Almost surely, 2^78686266231 is an apocalyptic number.

78686266231 is a deficient number, since it is larger than the sum of its proper divisors (192387369).

78686266231 is a wasteful number, since it uses less digits than its factorization.

78686266231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192387368.

The product of its digits is 6967296, while the sum is 55.

The spelling of 78686266231 in words is "seventy-eight billion, six hundred eighty-six million, two hundred sixty-six thousand, two hundred thirty-one".