999977610689 has 2 divisors, whose sum is σ = 999977610690. Its totient is φ = 999977610688.

The previous prime is 999977610607. The next prime is 999977610703. The reversal of 999977610689 is 986016779999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 564091123600 + 435886487089 = 751060^2 + 660217^2 .

It is a cyclic number.

It is not a de Polignac number, because 999977610689 - 2³² = 995682643393 is a prime.

It is not a weakly prime, because it can be changed into another prime (999977610589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499988805344 + 499988805345.

It is an arithmetic number, because the mean of its divisors is an integer number (499988805345).

Almost surely, 2^999977610689 is an apocalyptic number.

It is an amenable number.

999977610689 is a deficient number, since it is larger than the sum of its proper divisors (1).

999977610689 is an equidigital number, since it uses as much as digits as its factorization.

999977610689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 833299488, while the sum is 80.

The spelling of 999977610689 in words is "nine hundred ninety-nine billion, nine hundred seventy-seven million, six hundred ten thousand, six hundred eighty-nine".