99997659 has 28 divisors (see below), whose sum is σ = 150834000. Its totient is φ = 66263184.

The previous prime is 99997649. The next prime is 99997669. The reversal of 99997659 is 95679999.

It is an interprime number because it is at equal distance from previous prime (99997649) and next prime (99997669).

It is not a de Polignac number, because 99997659 - 2⁷ = 99997531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99997596 and 99997605.

It is not an unprimeable number, because it can be changed into a prime (99997609) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 166642 + ... + 167240.

Almost surely, 2^99997659 is an apocalyptic number.

99997659 is a deficient number, since it is larger than the sum of its proper divisors (50836341).

99997659 is an equidigital number, since it uses as much as digits as its factorization.

99997659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846 (or 831 counting only the distinct ones).

The product of its digits is 12400290, while the sum is 63.

The square root of 99997659 is about 9999.8829493150. The cubic root of 99997659 is about 464.1552613465.

The spelling of 99997659 in words is "ninety-nine million, nine hundred ninety-seven thousand, six hundred fifty-nine".