66226220644 has 12 divisors (see below), whose sum is σ = 117860223600. Its totient is φ = 32551871048.

The previous prime is 66226220603. The next prime is 66226220647. The reversal of 66226220644 is 44602262266.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66226220597 and 66226220606.

It is not an unprimeable number, because it can be changed into a prime (66226220647) 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, 140309554 + ... + 140310025.

It is an arithmetic number, because the mean of its divisors is an integer number (9821685300).

Almost surely, 2^66226220644 is an apocalyptic number.

It is an amenable number.

66226220644 is a deficient number, since it is larger than the sum of its proper divisors (51634002956).

66226220644 is a wasteful number, since it uses less digits than its factorization.

66226220644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280619642 (or 280619640 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

The spelling of 66226220644 in words is "sixty-six billion, two hundred twenty-six million, two hundred twenty thousand, six hundred forty-four".