645545263 has 8 divisors (see below), whose sum is σ = 704419200. Its totient is φ = 586702680.

The previous prime is 645545207. The next prime is 645545269. The reversal of 645545263 is 362545546.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 645545263 - 2⁹ = 645544751 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 (645545269) 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, 63456 + ... + 72922.

It is an arithmetic number, because the mean of its divisors is an integer number (88052400).

Almost surely, 2^645545263 is an apocalyptic number.

645545263 is a deficient number, since it is larger than the sum of its proper divisors (58873937).

645545263 is a wasteful number, since it uses less digits than its factorization.

645545263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15677.

The product of its digits is 432000, while the sum is 40.

The square root of 645545263 is about 25407.5827854599. The cubic root of 645545263 is about 864.2556609206.

The spelling of 645545263 in words is "six hundred forty-five million, five hundred forty-five thousand, two hundred sixty-three".