77777400079 has 2 divisors, whose sum is σ = 77777400080. Its totient is φ = 77777400078.

The previous prime is 77777399983. The next prime is 77777400083. The reversal of 77777400079 is 97000477777.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77777400079 - 2¹¹ = 77777398031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77777400979) 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, 38888700039 + 38888700040.

It is an arithmetic number, because the mean of its divisors is an integer number (38888700040).

Almost surely, 2^77777400079 is an apocalyptic number.

77777400079 is a deficient number, since it is larger than the sum of its proper divisors (1).

77777400079 is an equidigital number, since it uses as much as digits as its factorization.

77777400079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4235364, while the sum is 55.

The spelling of 77777400079 in words is "seventy-seven billion, seven hundred seventy-seven million, four hundred thousand, seventy-nine".