99900900997 has 2 divisors, whose sum is σ = 99900900998. Its totient is φ = 99900900996.

The previous prime is 99900900973. The next prime is 99900901003. The reversal of 99900900997 is 79900900999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86474812356 + 13426088641 = 294066^2 + 115871^2 .

It is a cyclic number.

It is not a de Polignac number, because 99900900997 - 2¹⁵ = 99900868229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99900900097) 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, 49950450498 + 49950450499.

It is an arithmetic number, because the mean of its divisors is an integer number (49950450499).

Almost surely, 2^99900900997 is an apocalyptic number.

It is an amenable number.

99900900997 is a deficient number, since it is larger than the sum of its proper divisors (1).

99900900997 is an equidigital number, since it uses as much as digits as its factorization.

99900900997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3720087, while the sum is 61.

The spelling of 99900900997 in words is "ninety-nine billion, nine hundred million, nine hundred thousand, nine hundred ninety-seven".