90999099899 has 2 divisors, whose sum is σ = 90999099900. Its totient is φ = 90999099898.

The previous prime is 90999099889. The next prime is 90999099929. The reversal of 90999099899 is 99899099909.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90999099899 - 2²⁰ = 90998051323 is a prime.

It is not a weakly prime, because it can be changed into another prime (90999099889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45499549949 + 45499549950.

It is an arithmetic number, because the mean of its divisors is an integer number (45499549950).

Almost surely, 2^90999099899 is an apocalyptic number.

90999099899 is a deficient number, since it is larger than the sum of its proper divisors (1).

90999099899 is an equidigital number, since it uses as much as digits as its factorization.

90999099899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 344373768, while the sum is 80.

The spelling of 90999099899 in words is "ninety billion, nine hundred ninety-nine million, ninety-nine thousand, eight hundred ninety-nine".