99818657 has 2 divisors, whose sum is σ = 99818658. Its totient is φ = 99818656.

The previous prime is 99818651. The next prime is 99818659. The reversal of 99818657 is 75681899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85673536 + 14145121 = 9256^2 + 3761^2 .

It is a cyclic number.

It is not a de Polignac number, because 99818657 - 2¹⁴ = 99802273 is a prime.

Together with 99818659, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 99818599 and 99818608.

It is not a weakly prime, because it can be changed into another prime (99818651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49909328 + 49909329.

It is an arithmetic number, because the mean of its divisors is an integer number (49909329).

Almost surely, 2^99818657 is an apocalyptic number.

It is an amenable number.

99818657 is a deficient number, since it is larger than the sum of its proper divisors (1).

99818657 is an equidigital number, since it uses as much as digits as its factorization.

99818657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 53.

The square root of 99818657 is about 9990.9287356081. The cubic root of 99818657 is about 463.8781403756.

The spelling of 99818657 in words is "ninety-nine million, eight hundred eighteen thousand, six hundred fifty-seven".