645467165 has 16 divisors (see below), whose sum is σ = 885841920. Its totient is φ = 442291200.

The previous prime is 645467149. The next prime is 645467171. The reversal of 645467165 is 561764546.

It is not a de Polignac number, because 645467165 - 2⁴ = 645467149 is a prime.

It is a super-2 number, since 2×645467165² = 833255722186274450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50276 + ... + 61794.

It is an arithmetic number, because the mean of its divisors is an integer number (55365120).

Almost surely, 2^645467165 is an apocalyptic number.

It is an amenable number.

645467165 is a deficient number, since it is larger than the sum of its proper divisors (240374755).

645467165 is a wasteful number, since it uses less digits than its factorization.

645467165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13132.

The product of its digits is 604800, while the sum is 44.

The square root of 645467165 is about 25406.0458355880. The cubic root of 645467165 is about 864.2208069944.

The spelling of 645467165 in words is "six hundred forty-five million, four hundred sixty-seven thousand, one hundred sixty-five".