63644421306441 has 4 divisors (see below), whose sum is σ = 84859228408592. Its totient is φ = 42429614204292.

The previous prime is 63644421306391. The next prime is 63644421306451. The reversal of 63644421306441 is 14460312444636.

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 63644421306441 - 2¹⁸ = 63644421044297 is a prime.

It is a super-2 number, since 2×63644421306441² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63644421306451) 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, 10607403551071 + ... + 10607403551076.

It is an arithmetic number, because the mean of its divisors is an integer number (21214807102148).

Almost surely, 2^{63644421306441} is an apocalyptic number.

It is an amenable number.

63644421306441 is a deficient number, since it is larger than the sum of its proper divisors (21214807102151).

63644421306441 is a wasteful number, since it uses less digits than its factorization.

63644421306441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21214807102150.

The product of its (nonzero) digits is 3981312, while the sum is 48.

The spelling of 63644421306441 in words is "sixty-three trillion, six hundred forty-four billion, four hundred twenty-one million, three hundred six thousand, four hundred forty-one".