645302310563 has 4 divisors (see below), whose sum is σ = 646212469680. Its totient is φ = 644392151448.

The previous prime is 645302310547. The next prime is 645302310581. The reversal of 645302310563 is 365013203546.

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 645302310563 - 2⁴ = 645302310547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645302310533) 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, 455078495 + ... + 455079912.

It is an arithmetic number, because the mean of its divisors is an integer number (161553117420).

Almost surely, 2^645302310563 is an apocalyptic number.

645302310563 is a deficient number, since it is larger than the sum of its proper divisors (910159117).

645302310563 is an equidigital number, since it uses as much as digits as its factorization.

645302310563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910159116.

The product of its (nonzero) digits is 194400, while the sum is 38.

The spelling of 645302310563 in words is "six hundred forty-five billion, three hundred two million, three hundred ten thousand, five hundred sixty-three".