77774720701 has 2 divisors, whose sum is σ = 77774720702. Its totient is φ = 77774720700.

The previous prime is 77774720693. The next prime is 77774720711. The reversal of 77774720701 is 10702747777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68892600676 + 8882120025 = 262474^2 + 94245^2 .

It is a cyclic number.

It is not a de Polignac number, because 77774720701 - 2³ = 77774720693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77774720711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38887360350 + 38887360351.

It is an arithmetic number, because the mean of its divisors is an integer number (38887360351).

Almost surely, 2^77774720701 is an apocalyptic number.

It is an amenable number.

77774720701 is a deficient number, since it is larger than the sum of its proper divisors (1).

77774720701 is an equidigital number, since it uses as much as digits as its factorization.

77774720701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 941192, while the sum is 49.

The spelling of 77774720701 in words is "seventy-seven billion, seven hundred seventy-four million, seven hundred twenty thousand, seven hundred one".