645365165 has 8 divisors (see below), whose sum is σ = 808109568. Its totient is φ = 493844560.

The previous prime is 645365117. The next prime is 645365167. The reversal of 645365165 is 561563546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645365165 - 2¹⁰ = 645364141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645365167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2805821 + ... + 2806050.

It is an arithmetic number, because the mean of its divisors is an integer number (101013696).

Almost surely, 2^645365165 is an apocalyptic number.

It is an amenable number.

645365165 is a deficient number, since it is larger than the sum of its proper divisors (162744403).

645365165 is a wasteful number, since it uses less digits than its factorization.

645365165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5611899.

The product of its digits is 324000, while the sum is 41.

The square root of 645365165 is about 25404.0383600718. The cubic root of 645365165 is about 864.1752817424.

The spelling of 645365165 in words is "six hundred forty-five million, three hundred sixty-five thousand, one hundred sixty-five".