165618899 has 2 divisors, whose sum is σ = 165618900. Its totient is φ = 165618898.

The previous prime is 165618881. The next prime is 165618941. The reversal of 165618899 is 998816561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165618899 - 2¹⁶ = 165553363 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165618899.

It is not a weakly prime, because it can be changed into another prime (165611899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82809449 + 82809450.

It is an arithmetic number, because the mean of its divisors is an integer number (82809450).

Almost surely, 2^165618899 is an apocalyptic number.

165618899 is a deficient number, since it is larger than the sum of its proper divisors (1).

165618899 is an equidigital number, since it uses as much as digits as its factorization.

165618899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 53.

The square root of 165618899 is about 12869.3006414490. The cubic root of 165618899 is about 549.1655655290.

The spelling of 165618899 in words is "one hundred sixty-five million, six hundred eighteen thousand, eight hundred ninety-nine".