645584299806 has 64 divisors (see below), whose sum is σ = 1308587892480. Its totient is φ = 212313454080.

The previous prime is 645584299793. The next prime is 645584299813. The reversal of 645584299806 is 608992485546.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 148852870 + ... + 148857206.

It is an arithmetic number, because the mean of its divisors is an integer number (20446685820).

Almost surely, 2^645584299806 is an apocalyptic number.

645584299806 is an abundant number, since it is smaller than the sum of its proper divisors (663003592674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645584299806 is a wasteful number, since it uses less digits than its factorization.

645584299806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5529.

The product of its (nonzero) digits is 149299200, while the sum is 66.

The spelling of 645584299806 in words is "six hundred forty-five billion, five hundred eighty-four million, two hundred ninety-nine thousand, eight hundred six".