6644123055331 has 4 divisors (see below), whose sum is σ = 6684884546632. Its totient is φ = 6603361564032.

The previous prime is 6644123055329. The next prime is 6644123055341. The reversal of 6644123055331 is 1335503214466.

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 6644123055331 - 2¹ = 6644123055329 is a prime.

It is a super-2 number, since 2×6644123055331² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6644123055341) 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, 20380745406 + ... + 20380745731.

It is an arithmetic number, because the mean of its divisors is an integer number (1671221136658).

Almost surely, 2^{6644123055331} is an apocalyptic number.

6644123055331 is a deficient number, since it is larger than the sum of its proper divisors (40761491301).

6644123055331 is a wasteful number, since it uses less digits than its factorization.

6644123055331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40761491300.

The product of its (nonzero) digits is 777600, while the sum is 43.

Adding to 6644123055331 its reverse (1335503214466), we get a palindrome (7979626269797).

The spelling of 6644123055331 in words is "six trillion, six hundred forty-four billion, one hundred twenty-three million, fifty-five thousand, three hundred thirty-one".