641406531326560 has 96 divisors (see below), whose sum is σ = 1521381246184800. Its totient is φ = 255537078730752.

The previous prime is 641406531326453. The next prime is 641406531326623. The reversal of 641406531326560 is 65623135604146.

It is a super-2 number, since 2×641406531326560² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641406531326498 and 641406531326507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 387222991 + ... + 388875889.

It is an arithmetic number, because the mean of its divisors is an integer number (15847721314425).

Almost surely, 2^{641406531326560} 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 641406531326560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (760690623092400).

641406531326560 is an abundant number, since it is smaller than the sum of its proper divisors (879974714858240).

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

641406531326560 is a wasteful number, since it uses less digits than its factorization.

641406531326560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662608 (or 1662600 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 52.

The spelling of 641406531326560 in words is "six hundred forty-one trillion, four hundred six billion, five hundred thirty-one million, three hundred twenty-six thousand, five hundred sixty".