77809342571 has 2 divisors, whose sum is σ = 77809342572. Its totient is φ = 77809342570.

The previous prime is 77809342561. The next prime is 77809342657. The reversal of 77809342571 is 17524390877.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77809342571 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (77809342561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38904671285 + 38904671286.

It is an arithmetic number, because the mean of its divisors is an integer number (38904671286).

Almost surely, 2^77809342571 is an apocalyptic number.

77809342571 is a deficient number, since it is larger than the sum of its proper divisors (1).

77809342571 is an equidigital number, since it uses as much as digits as its factorization.

77809342571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2963520, while the sum is 53.

The spelling of 77809342571 in words is "seventy-seven billion, eight hundred nine million, three hundred forty-two thousand, five hundred seventy-one".