77158991477 has 2 divisors, whose sum is σ = 77158991478. Its totient is φ = 77158991476.

The previous prime is 77158991423. The next prime is 77158991521. The reversal of 77158991477 is 77419985177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58925620516 + 18233370961 = 242746^2 + 135031^2 .

It is a cyclic number.

It is not a de Polignac number, because 77158991477 - 2²² = 77154797173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77158991677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38579495738 + 38579495739.

It is an arithmetic number, because the mean of its divisors is an integer number (38579495739).

Almost surely, 2^77158991477 is an apocalyptic number.

It is an amenable number.

77158991477 is a deficient number, since it is larger than the sum of its proper divisors (1).

77158991477 is an equidigital number, since it uses as much as digits as its factorization.

77158991477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31116960, while the sum is 65.

The spelling of 77158991477 in words is "seventy-seven billion, one hundred fifty-eight million, nine hundred ninety-one thousand, four hundred seventy-seven".