77930522557 has 4 divisors (see below), whose sum is σ = 77931319356. Its totient is φ = 77929725760.

The previous prime is 77930522539. The next prime is 77930522591. The reversal of 77930522557 is 75522503977.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 76106463876 + 1824058681 = 275874^2 + 42709^2 .

It is a cyclic number.

It is not a de Polignac number, because 77930522557 - 2³⁵ = 43570784189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77930522507) 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, 227158 + ... + 455479.

It is an arithmetic number, because the mean of its divisors is an integer number (19482829839).

Almost surely, 2^77930522557 is an apocalyptic number.

It is an amenable number.

77930522557 is a deficient number, since it is larger than the sum of its proper divisors (796799).

77930522557 is a wasteful number, since it uses less digits than its factorization.

77930522557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796798.

The product of its (nonzero) digits is 4630500, while the sum is 52.

The spelling of 77930522557 in words is "seventy-seven billion, nine hundred thirty million, five hundred twenty-two thousand, five hundred fifty-seven".