645407565 has 32 divisors (see below), whose sum is σ = 1130219136. Its totient is φ = 311900160.

The previous prime is 645407563. The next prime is 645407573. The reversal of 645407565 is 565704546.

It is not a de Polignac number, because 645407565 - 2¹ = 645407563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645407563) 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, 45397 + ... + 57893.

It is an arithmetic number, because the mean of its divisors is an integer number (35319348).

Almost surely, 2^645407565 is an apocalyptic number.

It is an amenable number.

645407565 is a deficient number, since it is larger than the sum of its proper divisors (484811571).

645407565 is a wasteful number, since it uses less digits than its factorization.

645407565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12829.

The product of its (nonzero) digits is 504000, while the sum is 42.

The square root of 645407565 is about 25404.8728593552. The cubic root of 645407565 is about 864.1942065474.

The spelling of 645407565 in words is "six hundred forty-five million, four hundred seven thousand, five hundred sixty-five".