644202642202 has 64 divisors (see below), whose sum is σ = 1149113952000. Its totient is φ = 270649579200.

The previous prime is 644202642197. The next prime is 644202642227. The reversal of 644202642202 is 202246202446.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 47294949 + ... + 47308567.

It is an arithmetic number, because the mean of its divisors is an integer number (17954905500).

Almost surely, 2^644202642202 is an apocalyptic number.

644202642202 is a deficient number, since it is larger than the sum of its proper divisors (504911309798).

644202642202 is a wasteful number, since it uses less digits than its factorization.

644202642202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14996 (or 14982 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 34.

Adding to 644202642202 its reverse (202246202446), we get a palindrome (846448844648).

The spelling of 644202642202 in words is "six hundred forty-four billion, two hundred two million, six hundred forty-two thousand, two hundred two".