1566644166 has 40 divisors (see below), whose sum is σ = 3513349224. Its totient is φ = 521782560.

The previous prime is 1566644161. The next prime is 1566644203. The reversal of 1566644166 is 6614466651.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566644161) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 236986 + ... + 243506.

Almost surely, 2^1566644166 is an apocalyptic number.

1566644166 is an abundant number, since it is smaller than the sum of its proper divisors (1946705058).

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

1566644166 is a wasteful number, since it uses less digits than its factorization.

1566644166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8018 (or 8009 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 1566644166 is about 39580.8560544110. The cubic root of 1566644166 is about 1161.4221968694.

The spelling of 1566644166 in words is "one billion, five hundred sixty-six million, six hundred forty-four thousand, one hundred sixty-six".