77640035779 has 2 divisors, whose sum is σ = 77640035780. Its totient is φ = 77640035778.

The previous prime is 77640035771. The next prime is 77640035783. The reversal of 77640035779 is 97753004677.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77640035779 - 2³ = 77640035771 is a prime.

It is not a weakly prime, because it can be changed into another prime (77640035771) 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, 38820017889 + 38820017890.

It is an arithmetic number, because the mean of its divisors is an integer number (38820017890).

Almost surely, 2^77640035779 is an apocalyptic number.

77640035779 is a deficient number, since it is larger than the sum of its proper divisors (1).

77640035779 is an equidigital number, since it uses as much as digits as its factorization.

77640035779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7779240, while the sum is 55.

The spelling of 77640035779 in words is "seventy-seven billion, six hundred forty million, thirty-five thousand, seven hundred seventy-nine".