66223643444 has 24 divisors (see below), whose sum is σ = 132505480128. Its totient is φ = 28369091520.

The previous prime is 66223643441. The next prime is 66223643459. The reversal of 66223643444 is 44434632266.

It is a super-2 number, since 2×66223643444² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66223643395 and 66223643404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66223643441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454574 + ... + 582309.

It is an arithmetic number, because the mean of its divisors is an integer number (5521061672).

Almost surely, 2^66223643444 is an apocalyptic number.

It is an amenable number.

66223643444 is an abundant number, since it is smaller than the sum of its proper divisors (66281836684).

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

66223643444 is a wasteful number, since it uses less digits than its factorization.

66223643444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039175 (or 1039173 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 44.

The spelling of 66223643444 in words is "sixty-six billion, two hundred twenty-three million, six hundred forty-three thousand, four hundred forty-four".