77766079 has 2 divisors, whose sum is σ = 77766080. Its totient is φ = 77766078.

The previous prime is 77766077. The next prime is 77766089. The reversal of 77766079 is 97066777.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77766079 - 2¹ = 77766077 is a prime.

Together with 77766077, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77766077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38883039 + 38883040.

It is an arithmetic number, because the mean of its divisors is an integer number (38883040).

Almost surely, 2^77766079 is an apocalyptic number.

77766079 is a deficient number, since it is larger than the sum of its proper divisors (1).

77766079 is an equidigital number, since it uses as much as digits as its factorization.

77766079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777924, while the sum is 49.

The square root of 77766079 is about 8818.5077535828. The cubic root of 77766079 is about 426.8383188593.

The spelling of 77766079 in words is "seventy-seven million, seven hundred sixty-six thousand, seventy-nine".