165600491 has 4 divisors (see below), whose sum is σ = 189257712. Its totient is φ = 141943272.

The previous prime is 165600473. The next prime is 165600503. The reversal of 165600491 is 194006561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165600491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165600401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11828600 + ... + 11828613.

It is an arithmetic number, because the mean of its divisors is an integer number (47314428).

Almost surely, 2^165600491 is an apocalyptic number.

165600491 is a deficient number, since it is larger than the sum of its proper divisors (23657221).

165600491 is an equidigital number, since it uses as much as digits as its factorization.

165600491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23657220.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 165600491 is about 12868.5854311964. The cubic root of 165600491 is about 549.1452187885.

The spelling of 165600491 in words is "one hundred sixty-five million, six hundred thousand, four hundred ninety-one".