99815657 has 2 divisors, whose sum is σ = 99815658. Its totient is φ = 99815656.

The previous prime is 99815633. The next prime is 99815659. The reversal of 99815657 is 75651899.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99281296 + 534361 = 9964^2 + 731^2 .

It is a cyclic number.

It is not a de Polignac number, because 99815657 - 2²² = 95621353 is a prime.

Together with 99815659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99815659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49907828 + 49907829.

It is an arithmetic number, because the mean of its divisors is an integer number (49907829).

Almost surely, 2^99815657 is an apocalyptic number.

It is an amenable number.

99815657 is a deficient number, since it is larger than the sum of its proper divisors (1).

99815657 is an equidigital number, since it uses as much as digits as its factorization.

99815657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 50.

The square root of 99815657 is about 9990.7785982875. The cubic root of 99815657 is about 463.8734931203.

The spelling of 99815657 in words is "ninety-nine million, eight hundred fifteen thousand, six hundred fifty-seven".