641687342022636 has 144 divisors (see below), whose sum is σ = 1854244179648000. Its totient is φ = 169115247415296.

The previous prime is 641687342022589. The next prime is 641687342022677. The reversal of 641687342022636 is 636220243786146.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 641687342022636.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3705100 + ... + 36015308.

It is an arithmetic number, because the mean of its divisors is an integer number (12876695692000).

Almost surely, 2^{641687342022636} 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 641687342022636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (927122089824000).

641687342022636 is an abundant number, since it is smaller than the sum of its proper divisors (1212556837625364).

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

641687342022636 is a wasteful number, since it uses less digits than its factorization.

641687342022636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32311648 (or 32311633 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 60.

The spelling of 641687342022636 in words is "six hundred forty-one trillion, six hundred eighty-seven billion, three hundred forty-two million, twenty-two thousand, six hundred thirty-six".