644732047102 has 16 divisors (see below), whose sum is σ = 1136171160432. Its totient is φ = 270516942720.

The previous prime is 644732047097. The next prime is 644732047111. The reversal of 644732047102 is 201740237446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1127153643 + ... + 1127154214.

It is an arithmetic number, because the mean of its divisors is an integer number (71010697527).

Almost surely, 2^644732047102 is an apocalyptic number.

644732047102 is a deficient number, since it is larger than the sum of its proper divisors (491439113330).

644732047102 is a wasteful number, since it uses less digits than its factorization.

644732047102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2254307883.

The product of its (nonzero) digits is 225792, while the sum is 40.

The spelling of 644732047102 in words is "six hundred forty-four billion, seven hundred thirty-two million, forty-seven thousand, one hundred two".