66666624228 has 36 divisors (see below), whose sum is σ = 168879306960. Its totient is φ = 22174617456.

The previous prime is 66666624191. The next prime is 66666624229. The reversal of 66666624228 is 82242666666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (66666624229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1965898 + ... + 1999521.

It is an arithmetic number, because the mean of its divisors is an integer number (4691091860).

Almost surely, 2^66666624228 is an apocalyptic number.

It is an amenable number.

66666624228 is an abundant number, since it is smaller than the sum of its proper divisors (102212682732).

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

66666624228 is a wasteful number, since it uses less digits than its factorization.

66666624228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3965896 (or 3965891 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 54.

The spelling of 66666624228 in words is "sixty-six billion, six hundred sixty-six million, six hundred twenty-four thousand, two hundred twenty-eight".