641794922229888 has 288 divisors, whose sum is σ = 2149502659197660. Its totient is φ = 183272045838336.

The previous prime is 641794922229829. The next prime is 641794922229899. The reversal of 641794922229888 is 888922229497146.

641794922229888 is a `hidden beast` number, since 6 + 4 + 1 + 7 + 9 + 492 + 22 + 29 + 8 + 88 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 441416402247744 + 200378519982144 = 21009912^2 + 14155512^2 .

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-2 number, since 2×641794922229888² (a number of 30 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 102691956 + ... + 108762252.

Almost surely, 2^{641794922229888} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641794922229888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1074751329598830).

641794922229888 is an abundant number, since it is smaller than the sum of its proper divisors (1507707736967772).

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

641794922229888 is a wasteful number, since it uses less digits than its factorization.

641794922229888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6072204 (or 6072182 counting only the distinct ones).

The product of its digits is 4013162496, while the sum is 81.

The spelling of 641794922229888 in words is "six hundred forty-one trillion, seven hundred ninety-four billion, nine hundred twenty-two million, two hundred twenty-nine thousand, eight hundred eighty-eight".