66340189 has 4 divisors (see below), whose sum is σ = 66779680. Its totient is φ = 65900700.

The previous prime is 66340177. The next prime is 66340201. The reversal of 66340189 is 98104366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (66340177) and next prime (66340201).

It is a cyclic number.

It is not a de Polignac number, because 66340189 - 2⁷ = 66340061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66340129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219519 + ... + 219820.

It is an arithmetic number, because the mean of its divisors is an integer number (16694920).

Almost surely, 2^66340189 is an apocalyptic number.

It is an amenable number.

66340189 is a deficient number, since it is larger than the sum of its proper divisors (439491).

66340189 is a wasteful number, since it uses less digits than its factorization.

66340189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439490.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 66340189 is about 8144.9486800102. The cubic root of 66340189 is about 404.8171485709.

The spelling of 66340189 in words is "sixty-six million, three hundred forty thousand, one hundred eighty-nine".