66189838 has 16 divisors (see below), whose sum is σ = 116642736. Its totient is φ = 27771840.

The previous prime is 66189829. The next prime is 66189859. The reversal of 66189838 is 83898166.

It is a junction number, because it is equal to n+sod(n) for n = 66189791 and 66189800.

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, 115431 + ... + 116002.

It is an arithmetic number, because the mean of its divisors is an integer number (7290171).

Almost surely, 2^66189838 is an apocalyptic number.

66189838 is a deficient number, since it is larger than the sum of its proper divisors (50452898).

66189838 is a wasteful number, since it uses less digits than its factorization.

66189838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231459.

The product of its digits is 497664, while the sum is 49.

The square root of 66189838 is about 8135.7137363602. The cubic root of 66189838 is about 404.5110962744.

The spelling of 66189838 in words is "sixty-six million, one hundred eighty-nine thousand, eight hundred thirty-eight".