645512363 has 4 divisors (see below), whose sum is σ = 667771440. Its totient is φ = 623253288.

The previous prime is 645512359. The next prime is 645512393. The reversal of 645512363 is 363215546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645512363 - 2² = 645512359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645512393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11129495 + ... + 11129552.

It is an arithmetic number, because the mean of its divisors is an integer number (166942860).

Almost surely, 2^645512363 is an apocalyptic number.

645512363 is a deficient number, since it is larger than the sum of its proper divisors (22259077).

645512363 is a wasteful number, since it uses less digits than its factorization.

645512363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22259076.

The product of its digits is 64800, while the sum is 35.

The square root of 645512363 is about 25406.9353327000. The cubic root of 645512363 is about 864.2409785035.

The spelling of 645512363 in words is "six hundred forty-five million, five hundred twelve thousand, three hundred sixty-three".