644211325605160 has 16 divisors (see below), whose sum is σ = 1449475482611700. Its totient is φ = 257684530242048.

The previous prime is 644211325605157. The next prime is 644211325605229. The reversal of 644211325605160 is 61506523112446.

It can be written as a sum of positive squares in 2 ways, for example, as 634317771863556 + 9893553741604 = 25185666^2 + 3145402^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 644211325605160.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8052641570025 + ... + 8052641570104.

Almost surely, 2^{644211325605160} is an apocalyptic number.

It is an amenable number.

644211325605160 is an abundant number, since it is smaller than the sum of its proper divisors (805264157006540).

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

644211325605160 is a wasteful number, since it uses less digits than its factorization.

644211325605160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16105283140140 (or 16105283140136 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 644211325605160 in words is "six hundred forty-four trillion, two hundred eleven billion, three hundred twenty-five million, six hundred five thousand, one hundred sixty".