77769393231 has 16 divisors (see below), whose sum is σ = 105527157120. Its totient is φ = 50930231520.

The previous prime is 77769393211. The next prime is 77769393253. The reversal of 77769393231 is 13239396777.

It is not a de Polignac number, because 77769393231 - 2⁵ = 77769393199 is a prime.

It is a super-2 number, since 2×77769393231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77769393211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83016 + ... + 403026.

It is an arithmetic number, because the mean of its divisors is an integer number (6595447320).

Almost surely, 2^77769393231 is an apocalyptic number.

77769393231 is a deficient number, since it is larger than the sum of its proper divisors (27757763889).

77769393231 is a wasteful number, since it uses less digits than its factorization.

77769393231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321446.

The product of its digits is 9001692, while the sum is 57.

The spelling of 77769393231 in words is "seventy-seven billion, seven hundred sixty-nine million, three hundred ninety-three thousand, two hundred thirty-one".