645148565 has 16 divisors (see below), whose sum is σ = 795533376. Its totient is φ = 501984000.

The previous prime is 645148549. The next prime is 645148577. The reversal of 645148565 is 565841546.

It is not a de Polignac number, because 645148565 - 2⁴ = 645148549 is a prime.

It is a Duffinian number.

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, 45590 + ... + 58040.

It is an arithmetic number, because the mean of its divisors is an integer number (49720836).

Almost surely, 2^645148565 is an apocalyptic number.

It is an amenable number.

645148565 is a deficient number, since it is larger than the sum of its proper divisors (150384811).

645148565 is a wasteful number, since it uses less digits than its factorization.

645148565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12740.

The product of its digits is 576000, while the sum is 44.

The square root of 645148565 is about 25399.7749005774. The cubic root of 645148565 is about 864.0785916199.

The spelling of 645148565 in words is "six hundred forty-five million, one hundred forty-eight thousand, five hundred sixty-five".