77877862991 has 2 divisors, whose sum is σ = 77877862992. Its totient is φ = 77877862990.

The previous prime is 77877862949. The next prime is 77877863017. The reversal of 77877862991 is 19926877877.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77877862991 - 2²² = 77873668687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77877861991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38938931495 + 38938931496.

It is an arithmetic number, because the mean of its divisors is an integer number (38938931496).

Almost surely, 2^77877862991 is an apocalyptic number.

77877862991 is a deficient number, since it is larger than the sum of its proper divisors (1).

77877862991 is an equidigital number, since it uses as much as digits as its factorization.

77877862991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 149361408, while the sum is 71.

The spelling of 77877862991 in words is "seventy-seven billion, eight hundred seventy-seven million, eight hundred sixty-two thousand, nine hundred ninety-one".