644576222082 has 64 divisors (see below), whose sum is σ = 1454898122496. Its totient is φ = 188893731840.

The previous prime is 644576222077. The next prime is 644576222113. The reversal of 644576222082 is 280222675446.

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 31 ways as a sum of consecutive naturals, for example, 353019 + ... + 1189022.

It is an arithmetic number, because the mean of its divisors is an integer number (22732783164).

Almost surely, 2^644576222082 is an apocalyptic number.

644576222082 is an abundant number, since it is smaller than the sum of its proper divisors (810321900414).

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

644576222082 is a wasteful number, since it uses less digits than its factorization.

644576222082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542315.

The product of its (nonzero) digits is 2580480, while the sum is 48.

The spelling of 644576222082 in words is "six hundred forty-four billion, five hundred seventy-six million, two hundred twenty-two thousand, eighty-two".