66189494 has 24 divisors (see below), whose sum is σ = 115794360. Its totient is φ = 28293216.

The previous prime is 66189493. The next prime is 66189503. The reversal of 66189494 is 49498166.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66189493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55169 + ... + 56355.

It is an arithmetic number, because the mean of its divisors is an integer number (4824765).

Almost surely, 2^66189494 is an apocalyptic number.

66189494 is a deficient number, since it is larger than the sum of its proper divisors (49604866).

66189494 is a wasteful number, since it uses less digits than its factorization.

66189494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772 (or 1765 counting only the distinct ones).

The product of its digits is 373248, while the sum is 47.

The square root of 66189494 is about 8135.6925949792. The cubic root of 66189494 is about 404.5103955019.

The spelling of 66189494 in words is "sixty-six million, one hundred eighty-nine thousand, four hundred ninety-four".