165415999 has 8 divisors (see below), whose sum is σ = 192251520. Its totient is φ = 139381656.

The previous prime is 165415993. The next prime is 165416039. The reversal of 165415999 is 999514561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165415999 - 2⁹ = 165415487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165415993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199849 + ... + 200674.

It is an arithmetic number, because the mean of its divisors is an integer number (24031440).

Almost surely, 2^165415999 is an apocalyptic number.

165415999 is a deficient number, since it is larger than the sum of its proper divisors (26835521).

165415999 is an equidigital number, since it uses as much as digits as its factorization.

165415999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400589.

The product of its digits is 437400, while the sum is 49.

The square root of 165415999 is about 12861.4151243166. The cubic root of 165415999 is about 548.9412126572.

The spelling of 165415999 in words is "one hundred sixty-five million, four hundred fifteen thousand, nine hundred ninety-nine".