99916639 has 2 divisors, whose sum is σ = 99916640. Its totient is φ = 99916638.

The previous prime is 99916637. The next prime is 99916673. The reversal of 99916639 is 93661999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99916639 - 2¹ = 99916637 is a prime.

Together with 99916637, 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 (99916637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49958319 + 49958320.

It is an arithmetic number, because the mean of its divisors is an integer number (49958320).

Almost surely, 2^99916639 is an apocalyptic number.

99916639 is a deficient number, since it is larger than the sum of its proper divisors (1).

99916639 is an equidigital number, since it uses as much as digits as its factorization.

99916639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 708588, while the sum is 52.

The square root of 99916639 is about 9995.8310810057. The cubic root of 99916639 is about 464.0298716772.

The spelling of 99916639 in words is "ninety-nine million, nine hundred sixteen thousand, six hundred thirty-nine".