641032541861 has 4 divisors (see below), whose sum is σ = 663137112300. Its totient is φ = 618927971424.

The previous prime is 641032541813. The next prime is 641032541879. The reversal of 641032541861 is 168145230146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 428133353761 + 212899188100 = 654319^2 + 461410^2 .

It is a cyclic number.

It is not a de Polignac number, because 641032541861 - 2¹⁴ = 641032525477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641032541161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11052285176 + ... + 11052285233.

It is an arithmetic number, because the mean of its divisors is an integer number (165784278075).

Almost surely, 2^641032541861 is an apocalyptic number.

It is an amenable number.

641032541861 is a deficient number, since it is larger than the sum of its proper divisors (22104570439).

641032541861 is a wasteful number, since it uses less digits than its factorization.

641032541861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22104570438.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 641032541861 in words is "six hundred forty-one billion, thirty-two million, five hundred forty-one thousand, eight hundred sixty-one".