66666667338 has 24 divisors (see below), whose sum is σ = 144520985700. Its totient is φ = 22210447104.

The previous prime is 66666667337. The next prime is 66666667369. The reversal of 66666667338 is 83376666666.

It is a happy number.

66666667338 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 65191876929 + 1474790409 = 255327^2 + 38403^2 .

It is not an unprimeable number, because it can be changed into a prime (66666667337) 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, 946333 + ... + 1014336.

Almost surely, 2^66666667338 is an apocalyptic number.

66666667338 is an abundant number, since it is smaller than the sum of its proper divisors (77854318362).

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

66666667338 is a wasteful number, since it uses less digits than its factorization.

66666667338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962566 (or 1962563 counting only the distinct ones).

The product of its digits is 141087744, while the sum is 63.

The spelling of 66666667338 in words is "sixty-six billion, six hundred sixty-six million, six hundred sixty-seven thousand, three hundred thirty-eight".