66043668 has 24 divisors (see below), whose sum is σ = 158267872. Its totient is φ = 21419424.

The previous prime is 66043619. The next prime is 66043669. The reversal of 66043668 is 86634066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66043669) 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, 73930 + ... + 74817.

Almost surely, 2^66043668 is an apocalyptic number.

It is an amenable number.

66043668 is an abundant number, since it is smaller than the sum of its proper divisors (92224204).

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

66043668 is a wasteful number, since it uses less digits than its factorization.

66043668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148791 (or 148789 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 66043668 is about 8126.7255398469. The cubic root of 66043668 is about 404.2131101245.

The spelling of 66043668 in words is "sixty-six million, forty-three thousand, six hundred sixty-eight".