165245897 has 4 divisors (see below), whose sum is σ = 167573376. Its totient is φ = 162918420.

The previous prime is 165245879. The next prime is 165245929. The reversal of 165245897 is 798542561.

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 not a de Polignac number, because 165245897 - 2⁶ = 165245833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165241897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1163633 + ... + 1163774.

It is an arithmetic number, because the mean of its divisors is an integer number (41893344).

Almost surely, 2^165245897 is an apocalyptic number.

It is an amenable number.

165245897 is a deficient number, since it is larger than the sum of its proper divisors (2327479).

165245897 is an equidigital number, since it uses as much as digits as its factorization.

165245897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327478.

The product of its digits is 604800, while the sum is 47.

The square root of 165245897 is about 12854.8005429878. The cubic root of 165245897 is about 548.7529841422.

The spelling of 165245897 in words is "one hundred sixty-five million, two hundred forty-five thousand, eight hundred ninety-seven".