66141666 has 12 divisors (see below), whose sum is σ = 143306982. Its totient is φ = 22047216.

The previous prime is 66141659. The next prime is 66141667. The reversal of 66141666 is 66614166.

It can be written as a sum of positive squares in only one way, i.e., 35105625 + 31036041 = 5925^2 + 5571^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66141666.

It is not an unprimeable number, because it can be changed into a prime (66141667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1837251 + ... + 1837286.

Almost surely, 2^66141666 is an apocalyptic number.

66141666 is an abundant number, since it is smaller than the sum of its proper divisors (77165316).

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

66141666 is a wasteful number, since it uses less digits than its factorization.

66141666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3674545 (or 3674542 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 66141666 is about 8132.7526705292. The cubic root of 66141666 is about 404.4129400304.

The spelling of 66141666 in words is "sixty-six million, one hundred forty-one thousand, six hundred sixty-six".