66738189 has 16 divisors (see below), whose sum is σ = 101824128. Its totient is φ = 38088192.

The previous prime is 66738187. The next prime is 66738197. The reversal of 66738189 is 98183766.

It is not a de Polignac number, because 66738189 - 2¹ = 66738187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66738187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21589 + ... + 24485.

It is an arithmetic number, because the mean of its divisors is an integer number (6364008).

Almost surely, 2^66738189 is an apocalyptic number.

It is an amenable number.

66738189 is a deficient number, since it is larger than the sum of its proper divisors (35085939).

66738189 is a wasteful number, since it uses less digits than its factorization.

66738189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004.

The product of its digits is 435456, while the sum is 48.

The square root of 66738189 is about 8169.3444657451. The cubic root of 66738189 is about 405.6250856400.

The spelling of 66738189 in words is "sixty-six million, seven hundred thirty-eight thousand, one hundred eighty-nine".