165868907 has 4 divisors (see below), whose sum is σ = 166080456. Its totient is φ = 165657360.

The previous prime is 165868867. The next prime is 165868919. The reversal of 165868907 is 709868561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 709868561 = 317 ⋅2239333.

It is a cyclic number.

It is not a de Polignac number, because 165868907 - 2¹⁴ = 165852523 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (165868957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104594 + ... + 106167.

It is an arithmetic number, because the mean of its divisors is an integer number (41520114).

Almost surely, 2^165868907 is an apocalyptic number.

165868907 is a deficient number, since it is larger than the sum of its proper divisors (211549).

165868907 is an equidigital number, since it uses as much as digits as its factorization.

165868907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211548.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 165868907 is about 12879.0103268846. The cubic root of 165868907 is about 549.4417553419.

The spelling of 165868907 in words is "one hundred sixty-five million, eight hundred sixty-eight thousand, nine hundred seven".