99669919 has 2 divisors, whose sum is σ = 99669920. Its totient is φ = 99669918.

The previous prime is 99669917. The next prime is 99669923. The reversal of 99669919 is 91996699.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99669919 - 2¹ = 99669917 is a prime.

It is a super-2 number, since 2×99669919² = 19868185506933122, which contains 22 as substring.

Together with 99669917, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99669917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49834959 + 49834960.

It is an arithmetic number, because the mean of its divisors is an integer number (49834960).

Almost surely, 2^99669919 is an apocalyptic number.

99669919 is a deficient number, since it is larger than the sum of its proper divisors (1).

99669919 is an equidigital number, since it uses as much as digits as its factorization.

99669919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2125764, while the sum is 58.

The square root of 99669919 is about 9983.4823082930. The cubic root of 99669919 is about 463.6476203260.

The spelling of 99669919 in words is "ninety-nine million, six hundred sixty-nine thousand, nine hundred nineteen".