66166628 has 12 divisors (see below), whose sum is σ = 126318192. Its totient is φ = 30075720.

The previous prime is 66166627. The next prime is 66166643. The reversal of 66166628 is 82666166.

It is not an unprimeable number, because it can be changed into a prime (66166621) 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, 751850 + ... + 751937.

It is an arithmetic number, because the mean of its divisors is an integer number (10526516).

Almost surely, 2^66166628 is an apocalyptic number.

It is an amenable number.

66166628 is a deficient number, since it is larger than the sum of its proper divisors (60151564).

66166628 is a wasteful number, since it uses less digits than its factorization.

66166628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503802 (or 1503800 counting only the distinct ones).

The product of its digits is 124416, while the sum is 41.

The square root of 66166628 is about 8134.2871845049. The cubic root of 66166628 is about 404.4638090551.

The spelling of 66166628 in words is "sixty-six million, one hundred sixty-six thousand, six hundred twenty-eight".