165688499 has 2 divisors, whose sum is σ = 165688500. Its totient is φ = 165688498.

The previous prime is 165688487. The next prime is 165688507. The reversal of 165688499 is 994886561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165688499 - 2⁴ = 165688483 is a prime.

It is not a weakly prime, because it can be changed into another prime (165688429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82844249 + 82844250.

It is an arithmetic number, because the mean of its divisors is an integer number (82844250).

Almost surely, 2^165688499 is an apocalyptic number.

165688499 is a deficient number, since it is larger than the sum of its proper divisors (1).

165688499 is an equidigital number, since it uses as much as digits as its factorization.

165688499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3732480, while the sum is 56.

The square root of 165688499 is about 12872.0044670595. The cubic root of 165688499 is about 549.2424822148.

The spelling of 165688499 in words is "one hundred sixty-five million, six hundred eighty-eight thousand, four hundred ninety-nine".