645220443882 has 32 divisors (see below), whose sum is σ = 1475030721024. Its totient is φ = 184318556400.

The previous prime is 645220443859. The next prime is 645220443911. The reversal of 645220443882 is 288344022546.

It is a super-2 number, since 2×645220443882² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 995344 + ... + 1510347.

It is an arithmetic number, because the mean of its divisors is an integer number (46094710032).

Almost surely, 2^645220443882 is an apocalyptic number.

645220443882 is an abundant number, since it is smaller than the sum of its proper divisors (829810277142).

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

645220443882 is a wasteful number, since it uses less digits than its factorization.

645220443882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2511834.

The product of its (nonzero) digits is 2949120, while the sum is 48.

The spelling of 645220443882 in words is "six hundred forty-five billion, two hundred twenty million, four hundred forty-three thousand, eight hundred eighty-two".