641356661062344 has 128 divisors (see below), whose sum is σ = 1729881168192000. Its totient is φ = 197397527568384.

The previous prime is 641356661062333. The next prime is 641356661062357. The reversal of 641356661062344 is 443260166653146.

It is a super-2 number, since 2×641356661062344² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 267137137 + ... + 269527295.

It is an arithmetic number, because the mean of its divisors is an integer number (13514696626500).

Almost surely, 2^{641356661062344} 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 641356661062344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (864940584096000).

641356661062344 is an abundant number, since it is smaller than the sum of its proper divisors (1088524507129656).

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

641356661062344 is a wasteful number, since it uses less digits than its factorization.

641356661062344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2402647 (or 2402643 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 57.

The spelling of 641356661062344 in words is "six hundred forty-one trillion, three hundred fifty-six billion, six hundred sixty-one million, sixty-two thousand, three hundred forty-four".