22331425644 has 72 divisors (see below), whose sum is σ = 61704552000. Its totient is φ = 6753477600.

The previous prime is 22331425621. The next prime is 22331425703. The reversal of 22331425644 is 44652413322.

22331425644 is a `hidden beast` number, since 2 + 2 + 3 + 3 + 1 + 4 + 2 + 5 + 644 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 22331425599 and 22331425608.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141099 + ... + 254109.

Almost surely, 2^22331425644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22331425644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30852276000).

22331425644 is an abundant number, since it is smaller than the sum of its proper divisors (39373126356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22331425644 is a wasteful number, since it uses less digits than its factorization.

22331425644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113531 (or 113526 counting only the distinct ones).

The product of its digits is 138240, while the sum is 36.

Adding to 22331425644 its reverse (44652413322), we get a palindrome (66983838966).

The spelling of 22331425644 in words is "twenty-two billion, three hundred thirty-one million, four hundred twenty-five thousand, six hundred forty-four".