77716601 has 2 divisors, whose sum is σ = 77716602. Its totient is φ = 77716600.

The previous prime is 77716591. The next prime is 77716621. The reversal of 77716601 is 10661777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63616576 + 14100025 = 7976^2 + 3755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77716601 is a prime.

It is not a weakly prime, because it can be changed into another prime (77716621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38858300 + 38858301.

It is an arithmetic number, because the mean of its divisors is an integer number (38858301).

Almost surely, 2^77716601 is an apocalyptic number.

It is an amenable number.

77716601 is a deficient number, since it is larger than the sum of its proper divisors (1).

77716601 is an equidigital number, since it uses as much as digits as its factorization.

77716601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 77716601 is about 8815.7019573032. The cubic root of 77716601 is about 426.7477755824.

The spelling of 77716601 in words is "seventy-seven million, seven hundred sixteen thousand, six hundred one".