77677464391 has 2 divisors, whose sum is σ = 77677464392. Its totient is φ = 77677464390.

The previous prime is 77677464331. The next prime is 77677464439. The reversal of 77677464391 is 19346477677.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77677464391 - 2²⁷ = 77543246663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77677464301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38838732195 + 38838732196.

It is an arithmetic number, because the mean of its divisors is an integer number (38838732196).

Almost surely, 2^77677464391 is an apocalyptic number.

77677464391 is a deficient number, since it is larger than the sum of its proper divisors (1).

77677464391 is an equidigital number, since it uses as much as digits as its factorization.

77677464391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37340352, while the sum is 61.

The spelling of 77677464391 in words is "seventy-seven billion, six hundred seventy-seven million, four hundred sixty-four thousand, three hundred ninety-one".