644163363232202 has 32 divisors (see below), whose sum is σ = 1111743577598400. Its totient is φ = 276845949532800.

The previous prime is 644163363232157. The next prime is 644163363232261. The reversal of 644163363232202 is 202232363361446.

It is a happy number.

It is a super-2 number, since 2×644163363232202² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1513599299 + ... + 1514024822.

It is an arithmetic number, because the mean of its divisors is an integer number (34741986799950).

Almost surely, 2^{644163363232202} is an apocalyptic number.

644163363232202 is a deficient number, since it is larger than the sum of its proper divisors (467580214366198).

644163363232202 is a wasteful number, since it uses less digits than its factorization.

644163363232202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3027624662.

The product of its (nonzero) digits is 4478976, while the sum is 47.

The spelling of 644163363232202 in words is "six hundred forty-four trillion, one hundred sixty-three billion, three hundred sixty-three million, two hundred thirty-two thousand, two hundred two".