63644421106231 has 4 divisors (see below), whose sum is σ = 72736481264272. Its totient is φ = 54552360948192.

The previous prime is 63644421106213. The next prime is 63644421106237. The reversal of 63644421106231 is 13260112444636.

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

It is a cyclic number.

It is not a de Polignac number, because 63644421106231 - 2¹⁵ = 63644421073463 is a prime.

It is a super-2 number, since 2×63644421106231² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63644421106237) 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, 4546030079010 + ... + 4546030079023.

It is an arithmetic number, because the mean of its divisors is an integer number (18184120316068).

Almost surely, 2^{63644421106231} is an apocalyptic number.

63644421106231 is a deficient number, since it is larger than the sum of its proper divisors (9092060158041).

63644421106231 is an equidigital number, since it uses as much as digits as its factorization.

63644421106231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9092060158040.

The product of its (nonzero) digits is 497664, while the sum is 43.

The spelling of 63644421106231 in words is "sixty-three trillion, six hundred forty-four billion, four hundred twenty-one million, one hundred six thousand, two hundred thirty-one".