641273541361 has 6 divisors (see below), whose sum is σ = 676801161762. Its totient is φ = 607522302000.

The previous prime is 641273541341. The next prime is 641273541451. The reversal of 641273541361 is 163145372146.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 624011523136 + 17262018225 = 789944^2 + 131385^2 .

It is not a de Polignac number, because 641273541361 - 2²⁵ = 641239986929 is a prime.

It is a super-2 number, since 2×641273541361² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641273541331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 888190140 + ... + 888190861.

It is an arithmetic number, because the mean of its divisors is an integer number (112800193627).

Almost surely, 2^641273541361 is an apocalyptic number.

It is an amenable number.

641273541361 is a deficient number, since it is larger than the sum of its proper divisors (35527620401).

641273541361 is a wasteful number, since it uses less digits than its factorization.

641273541361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776381039 (or 1776381020 counting only the distinct ones).

The product of its digits is 362880, while the sum is 43.

The spelling of 641273541361 in words is "six hundred forty-one billion, two hundred seventy-three million, five hundred forty-one thousand, three hundred sixty-one".