641630221600 has 72 divisors (see below), whose sum is σ = 1604584245348. Its totient is φ = 250392268800.

The previous prime is 641630221523. The next prime is 641630221649. The reversal of 641630221600 is 6122036146.

It can be written as a sum of positive squares in 6 ways, for example, as 254213606416 + 387416615184 = 504196^2 + 622428^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9748149 + ... + 9813748.

Almost surely, 2^641630221600 is an apocalyptic number.

It is an amenable number.

641630221600 is an abundant number, since it is smaller than the sum of its proper divisors (962954023748).

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

641630221600 is a wasteful number, since it uses less digits than its factorization.

641630221600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19561958 (or 19561945 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 641630221600 its reverse (6122036146), we get a palindrome (647752257746).

The spelling of 641630221600 in words is "six hundred forty-one billion, six hundred thirty million, two hundred twenty-one thousand, six hundred".