9999999998977 has 2 divisors, whose sum is σ = 9999999998978. Its totient is φ = 9999999998976.

The previous prime is 9999999998971. The next prime is 9999999998981. The reversal of 9999999998977 is 7798999999999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9594283231296 + 405716767681 = 3097464^2 + 636959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9999999998977 is a prime.

It is not a weakly prime, because it can be changed into another prime (9999999998971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999999999488 + 4999999999489.

It is an arithmetic number, because the mean of its divisors is an integer number (4999999999489).

Almost surely, 2^{9999999998977} is an apocalyptic number.

It is an amenable number.

9999999998977 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999999998977 is an equidigital number, since it uses as much as digits as its factorization.

9999999998977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1366819485192, while the sum is 112.

The spelling of 9999999998977 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-eight thousand, nine hundred seventy-seven".