641441131638 has 16 divisors (see below), whose sum is σ = 1290297769776. Its totient is φ = 212577792800.

The previous prime is 641441131631. The next prime is 641441131649. The reversal of 641441131638 is 836131144146.

It is a super-2 number, since 2×641441131638² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641441131638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641441131631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308978313 + ... + 308980388.

It is an arithmetic number, because the mean of its divisors is an integer number (80643610611).

Almost surely, 2^641441131638 is an apocalyptic number.

641441131638 is an abundant number, since it is smaller than the sum of its proper divisors (648856638138).

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

641441131638 is a wasteful number, since it uses less digits than its factorization.

641441131638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617958879.

The product of its digits is 165888, while the sum is 42.

The spelling of 641441131638 in words is "six hundred forty-one billion, four hundred forty-one million, one hundred thirty-one thousand, six hundred thirty-eight".