641441903616 has 132 divisors (see below), whose sum is σ = 1877523457732. Its totient is φ = 210884788224.

The previous prime is 641441903587. The next prime is 641441903617. The reversal of 641441903616 is 616309144146.

641441903616 is a `hidden beast` number, since 6 + 4 + 14 + 4 + 19 + 0 + 3 + 616 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 530216985600 + 111224918016 = 728160^2 + 333504^2 .

It is a super-2 number, since 2×641441903616² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641441903617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 196050 + ... + 1149486.

Almost surely, 2^641441903616 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 641441903616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (938761728866).

641441903616 is an abundant number, since it is smaller than the sum of its proper divisors (1236081554116).

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

641441903616 is a wasteful number, since it uses less digits than its factorization.

641441903616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953536 (or 953515 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 641441903616 in words is "six hundred forty-one billion, four hundred forty-one million, nine hundred three thousand, six hundred sixteen".