641572401338 has 32 divisors (see below), whose sum is σ = 1052413793280. Its totient is φ = 290911342000.

The previous prime is 641572401331. The next prime is 641572401343. The reversal of 641572401338 is 833104275146.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (641572401331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15338393 + ... + 15380163.

It is an arithmetic number, because the mean of its divisors is an integer number (32887931040).

Almost surely, 2^641572401338 is an apocalyptic number.

641572401338 is a deficient number, since it is larger than the sum of its proper divisors (410841391942).

641572401338 is a wasteful number, since it uses less digits than its factorization.

641572401338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43474.

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 641572401338 in words is "six hundred forty-one billion, five hundred seventy-two million, four hundred one thousand, three hundred thirty-eight".