77666660431 has 8 divisors (see below), whose sum is σ = 79596408528. Its totient is φ = 75738600000.

The previous prime is 77666660413. The next prime is 77666660497. The reversal of 77666660431 is 13406666677.

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 77666660431 - 2¹⁷ = 77666529359 is a prime.

It is a super-2 number, since 2×77666660431² (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 (77666660131) 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, 328480 + ... + 513061.

It is an arithmetic number, because the mean of its divisors is an integer number (9949551066).

Almost surely, 2^77666660431 is an apocalyptic number.

77666660431 is a deficient number, since it is larger than the sum of its proper divisors (1929748097).

77666660431 is a wasteful number, since it uses less digits than its factorization.

77666660431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843833.

The product of its (nonzero) digits is 4572288, while the sum is 52.

The spelling of 77666660431 in words is "seventy-seven billion, six hundred sixty-six million, six hundred sixty thousand, four hundred thirty-one".