99970415777 has 2 divisors, whose sum is σ = 99970415778. Its totient is φ = 99970415776.

The previous prime is 99970415737. The next prime is 99970415821. The reversal of 99970415777 is 77751407999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53342059681 + 46628356096 = 230959^2 + 215936^2 .

It is a cyclic number.

It is not a de Polignac number, because 99970415777 - 2³⁴ = 82790546593 is a prime.

It is not a weakly prime, because it can be changed into another prime (99970415717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49985207888 + 49985207889.

It is an arithmetic number, because the mean of its divisors is an integer number (49985207889).

Almost surely, 2^99970415777 is an apocalyptic number.

It is an amenable number.

99970415777 is a deficient number, since it is larger than the sum of its proper divisors (1).

99970415777 is an equidigital number, since it uses as much as digits as its factorization.

99970415777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35006580, while the sum is 65.

The spelling of 99970415777 in words is "ninety-nine billion, nine hundred seventy million, four hundred fifteen thousand, seven hundred seventy-seven".