99658639 has 2 divisors, whose sum is σ = 99658640. Its totient is φ = 99658638.

The previous prime is 99658627. The next prime is 99658661. The reversal of 99658639 is 93685699.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99658639 - 2⁹ = 99658127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99658639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99658939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49829319 + 49829320.

It is an arithmetic number, because the mean of its divisors is an integer number (49829320).

Almost surely, 2^99658639 is an apocalyptic number.

99658639 is a deficient number, since it is larger than the sum of its proper divisors (1).

99658639 is an equidigital number, since it uses as much as digits as its factorization.

99658639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3149280, while the sum is 55.

The square root of 99658639 is about 9982.9173591691. The cubic root of 99658639 is about 463.6301287815.

The spelling of 99658639 in words is "ninety-nine million, six hundred fifty-eight thousand, six hundred thirty-nine".