99997128899 has 2 divisors, whose sum is σ = 99997128900. Its totient is φ = 99997128898.

The previous prime is 99997128851. The next prime is 99997128919. The reversal of 99997128899 is 99882179999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99997128899 - 2⁸ = 99997128643 is a prime.

It is not a weakly prime, because it can be changed into another prime (99997128199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49998564449 + 49998564450.

It is an arithmetic number, because the mean of its divisors is an integer number (49998564450).

Almost surely, 2^99997128899 is an apocalyptic number.

99997128899 is a deficient number, since it is larger than the sum of its proper divisors (1).

99997128899 is an equidigital number, since it uses as much as digits as its factorization.

99997128899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476171136, while the sum is 80.

The spelling of 99997128899 in words is "ninety-nine billion, nine hundred ninety-seven million, one hundred twenty-eight thousand, eight hundred ninety-nine".