99990919999 has 2 divisors, whose sum is σ = 99990920000. Its totient is φ = 99990919998.

The previous prime is 99990919961. The next prime is 99990920021. The reversal of 99990919999 is 99991909999.

It is a strong prime.

It is an emirp because it is prime and its reverse (99991909999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99990919999 - 2²⁵ = 99957365567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99990919939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49995459999 + 49995460000.

It is an arithmetic number, because the mean of its divisors is an integer number (49995460000).

Almost surely, 2^99990919999 is an apocalyptic number.

99990919999 is a deficient number, since it is larger than the sum of its proper divisors (1).

99990919999 is an equidigital number, since it uses as much as digits as its factorization.

99990919999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387420489, while the sum is 82.

The spelling of 99990919999 in words is "ninety-nine billion, nine hundred ninety million, nine hundred nineteen thousand, nine hundred ninety-nine".