66946109 has 4 divisors (see below), whose sum is σ = 67457280. Its totient is φ = 66434940.

The previous prime is 66946093. The next prime is 66946127. The reversal of 66946109 is 90164966.

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 a cyclic number.

It is not a de Polignac number, because 66946109 - 2⁴ = 66946093 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 (66946129) 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, 255389 + ... + 255650.

It is an arithmetic number, because the mean of its divisors is an integer number (16864320).

Almost surely, 2^66946109 is an apocalyptic number.

It is an amenable number.

66946109 is a deficient number, since it is larger than the sum of its proper divisors (511171).

66946109 is a wasteful number, since it uses less digits than its factorization.

66946109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511170.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 66946109 is about 8182.0601928854. The cubic root of 66946109 is about 406.0458848704.

The spelling of 66946109 in words is "sixty-six million, nine hundred forty-six thousand, one hundred nine".