136666223 has 4 divisors (see below), whose sum is σ = 138312888. Its totient is φ = 135019560.

The previous prime is 136666217. The next prime is 136666249. The reversal of 136666223 is 322666631.

136666223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 136666223 - 2¹⁴ = 136649839 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 (136662223) 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, 823208 + ... + 823373.

It is an arithmetic number, because the mean of its divisors is an integer number (34578222).

Almost surely, 2^136666223 is an apocalyptic number.

136666223 is a deficient number, since it is larger than the sum of its proper divisors (1646665).

136666223 is an equidigital number, since it uses as much as digits as its factorization.

136666223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646664.

The product of its digits is 46656, while the sum is 35.

The square root of 136666223 is about 11690.4329688853. The cubic root of 136666223 is about 515.0946795481.

The spelling of 136666223 in words is "one hundred thirty-six million, six hundred sixty-six thousand, two hundred twenty-three".