999999996977 has 2 divisors, whose sum is σ = 999999996978. Its totient is φ = 999999996976.

The previous prime is 999999996901. The next prime is 999999996979. The reversal of 999999996977 is 779699999999.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 698334320896 + 301665676081 = 835664^2 + 549241^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999996977 - 2¹⁴ = 999999980593 is a prime.

Together with 999999996979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999999996979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999998488 + 499999998489.

It is an arithmetic number, because the mean of its divisors is an integer number (499999998489).

Almost surely, 2^999999996977 is an apocalyptic number.

It is an amenable number.

999999996977 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999996977 is an equidigital number, since it uses as much as digits as its factorization.

999999996977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113901623766, while the sum is 101.

The spelling of 999999996977 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-six thousand, nine hundred seventy-seven".