644566046002 has 16 divisors (see below), whose sum is σ = 993472660440. Its totient is φ = 313417133568.

The previous prime is 644566045987. The next prime is 644566046023. The reversal of 644566046002 is 200640665446.

It can be written as a sum of positive squares in 4 ways, for example, as 589039365121 + 55526680881 = 767489^2 + 235641^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 644566046002.

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, 2009977 + ... + 2308492.

Almost surely, 2^644566046002 is an apocalyptic number.

644566046002 is a deficient number, since it is larger than the sum of its proper divisors (348906614438).

644566046002 is a wasteful number, since it uses less digits than its factorization.

644566046002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4320525.

The product of its (nonzero) digits is 829440, while the sum is 43.

The spelling of 644566046002 in words is "six hundred forty-four billion, five hundred sixty-six million, forty-six thousand, two".