9999993998977 has 2 divisors, whose sum is σ = 9999993998978. Its totient is φ = 9999993998976.

The previous prime is 9999993998957. The next prime is 9999993999119. The reversal of 9999993998977 is 7798993999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8172714569616 + 1827279429361 = 2858796^2 + 1351769^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999993998977 - 2²³ = 9999985610369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9999993998977.

It is not a weakly prime, because it can be changed into another prime (9999993998957) 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, 4999996999488 + 4999996999489.

It is an arithmetic number, because the mean of its divisors is an integer number (4999996999489).

Almost surely, 2^{9999993998977} is an apocalyptic number.

It is an amenable number.

9999993998977 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999993998977 is an equidigital number, since it uses as much as digits as its factorization.

9999993998977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 455606495064, while the sum is 106.

The spelling of 9999993998977 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred ninety-three million, nine hundred ninety-eight thousand, nine hundred seventy-seven".