66189894 has 16 divisors (see below), whose sum is σ = 132514032. Its totient is φ = 22040928.

The previous prime is 66189889. The next prime is 66189911. The reversal of 66189894 is 49898166.

It is a happy number.

It is a super-2 number, since 2×66189894² = 8762204135462472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1512 + ... + 11604.

It is an arithmetic number, because the mean of its divisors is an integer number (8282127).

Almost surely, 2^66189894 is an apocalyptic number.

66189894 is an abundant number, since it is smaller than the sum of its proper divisors (66324138).

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

66189894 is a wasteful number, since it uses less digits than its factorization.

66189894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11191.

The product of its digits is 746496, while the sum is 51.

The square root of 66189894 is about 8135.7171779752. The cubic root of 66189894 is about 404.5112103534.

The spelling of 66189894 in words is "sixty-six million, one hundred eighty-nine thousand, eight hundred ninety-four".