165700109 has 4 divisors (see below), whose sum is σ = 165726816. Its totient is φ = 165673404.

The previous prime is 165700103. The next prime is 165700151. The reversal of 165700109 is 901007561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165700109 is a prime.

It is a super-2 number, since 2×165700109² = 54913052245223762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165700103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1352 + ... + 18254.

It is an arithmetic number, because the mean of its divisors is an integer number (41431704).

Almost surely, 2^165700109 is an apocalyptic number.

It is an amenable number.

165700109 is a deficient number, since it is larger than the sum of its proper divisors (26707).

165700109 is an equidigital number, since it uses as much as digits as its factorization.

165700109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26706.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 165700109 is about 12872.4554378720. The cubic root of 165700109 is about 549.2553106173.

The spelling of 165700109 in words is "one hundred sixty-five million, seven hundred thousand, one hundred nine".