645043365 has 32 divisors (see below), whose sum is σ = 1174723200. Its totient is φ = 335629440.

The previous prime is 645043363. The next prime is 645043379. The reversal of 645043365 is 563340546.

645043365 is a `hidden beast` number, since 64 + 504 + 33 + 65 = 666.

It is not a de Polignac number, because 645043365 - 2¹ = 645043363 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645043363) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52735 + ... + 63804.

It is an arithmetic number, because the mean of its divisors is an integer number (36710100).

Almost surely, 2^645043365 is an apocalyptic number.

It is an amenable number.

645043365 is a deficient number, since it is larger than the sum of its proper divisors (529679835).

645043365 is a wasteful number, since it uses less digits than its factorization.

645043365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116594 (or 116588 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

The square root of 645043365 is about 25397.7039316549. The cubic root of 645043365 is about 864.0316225887.

The spelling of 645043365 in words is "six hundred forty-five million, forty-three thousand, three hundred sixty-five".