641045255421 has 4 divisors (see below), whose sum is σ = 854727007232. Its totient is φ = 427363503612.

The previous prime is 641045255413. The next prime is 641045255467. The reversal of 641045255421 is 124552540146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 641045255421 - 2³ = 641045255413 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 641045255421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641049255421) 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 3 ways as a sum of consecutive naturals, for example, 106840875901 + ... + 106840875906.

It is an arithmetic number, because the mean of its divisors is an integer number (213681751808).

Almost surely, 2^641045255421 is an apocalyptic number.

It is an amenable number.

641045255421 is a deficient number, since it is larger than the sum of its proper divisors (213681751811).

641045255421 is a wasteful number, since it uses less digits than its factorization.

641045255421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213681751810.

The product of its (nonzero) digits is 192000, while the sum is 39.

Adding to 641045255421 its reverse (124552540146), we get a palindrome (765597795567).

The spelling of 641045255421 in words is "six hundred forty-one billion, forty-five million, two hundred fifty-five thousand, four hundred twenty-one".