645236265 has 16 divisors (see below), whose sum is σ = 1033413696. Its totient is φ = 343780800.

The previous prime is 645236239. The next prime is 645236287. The reversal of 645236265 is 562632546.

It is not a de Polignac number, because 645236265 - 2⁹ = 645235753 is a prime.

It is a Curzon 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, 5751 + ... + 36380.

It is an arithmetic number, because the mean of its divisors is an integer number (64588356).

Almost surely, 2^645236265 is an apocalyptic number.

It is an amenable number.

645236265 is a deficient number, since it is larger than the sum of its proper divisors (388177431).

645236265 is a wasteful number, since it uses less digits than its factorization.

645236265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43160.

The product of its digits is 259200, while the sum is 39.

The square root of 645236265 is about 25401.5012351632. The cubic root of 645236265 is about 864.1177434593.

The spelling of 645236265 in words is "six hundred forty-five million, two hundred thirty-six thousand, two hundred sixty-five".