165664395 has 48 divisors (see below), whose sum is σ = 316828512. Its totient is φ = 79557120.

The previous prime is 165664391. The next prime is 165664409. The reversal of 165664395 is 593466561.

165664395 = 91² + 92² + ... + 792².

It is not a de Polignac number, because 165664395 - 2² = 165664391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 165664395.

It is not an unprimeable number, because it can be changed into a prime (165664391) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20532 + ... + 27438.

It is an arithmetic number, because the mean of its divisors is an integer number (6600594).

Almost surely, 2^165664395 is an apocalyptic number.

165664395 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165664395 is a deficient number, since it is larger than the sum of its proper divisors (151164117).

165664395 is a wasteful number, since it uses less digits than its factorization.

165664395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6972 (or 6969 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The square root of 165664395 is about 12871.0681374935. The cubic root of 165664395 is about 549.2158467253.

The spelling of 165664395 in words is "one hundred sixty-five million, six hundred sixty-four thousand, three hundred ninety-five".