645565213363 has 4 divisors (see below), whose sum is σ = 737788815280. Its totient is φ = 553341611448.

The previous prime is 645565213333. The next prime is 645565213387. The reversal of 645565213363 is 363312565546.

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 645565213363 - 2¹³ = 645565205171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645565213333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46111800948 + ... + 46111800961.

It is an arithmetic number, because the mean of its divisors is an integer number (184447203820).

Almost surely, 2^645565213363 is an apocalyptic number.

645565213363 is a deficient number, since it is larger than the sum of its proper divisors (92223601917).

645565213363 is an equidigital number, since it uses as much as digits as its factorization.

645565213363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92223601916.

The product of its digits is 5832000, while the sum is 49.

The spelling of 645565213363 in words is "six hundred forty-five billion, five hundred sixty-five million, two hundred thirteen thousand, three hundred sixty-three".