77431399485957 has 32 divisors (see below), whose sum is σ = 125142159605760. Its totient is φ = 46927931949360.

The previous prime is 77431399485953. The next prime is 77431399485971. The reversal of 77431399485957 is 75958499313477.

77431399485957 is a `hidden beast` number, since 7 + 7 + 4 + 3 + 13 + 9 + 9 + 4 + 8 + 595 + 7 = 666.

It is not a de Polignac number, because 77431399485957 - 2² = 77431399485953 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77431399485953) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119464918 + ... + 120111320.

It is an arithmetic number, because the mean of its divisors is an integer number (3910692487680).

Almost surely, 2^{77431399485957} is an apocalyptic number.

It is an amenable number.

77431399485957 is a deficient number, since it is larger than the sum of its proper divisors (47710760119803).

77431399485957 is a wasteful number, since it uses less digits than its factorization.

77431399485957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049750 (or 1049744 counting only the distinct ones).

The product of its digits is 7201353600, while the sum is 81.

The spelling of 77431399485957 in words is "seventy-seven trillion, four hundred thirty-one billion, three hundred ninety-nine million, four hundred eighty-five thousand, nine hundred fifty-seven".