645584299807 has 4 divisors (see below), whose sum is σ = 654677036496. Its totient is φ = 636491563120.

The previous prime is 645584299793. The next prime is 645584299813. The reversal of 645584299807 is 708992485546.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645584299807 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 (645584299897) 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, 4546368238 + ... + 4546368379.

It is an arithmetic number, because the mean of its divisors is an integer number (163669259124).

Almost surely, 2^645584299807 is an apocalyptic number.

645584299807 is a deficient number, since it is larger than the sum of its proper divisors (9092736689).

645584299807 is an equidigital number, since it uses as much as digits as its factorization.

645584299807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9092736688.

The product of its (nonzero) digits is 174182400, while the sum is 67.

The spelling of 645584299807 in words is "six hundred forty-five billion, five hundred eighty-four million, two hundred ninety-nine thousand, eight hundred seven".