136666211 has 4 divisors (see below), whose sum is σ = 149090424. Its totient is φ = 124242000.

The previous prime is 136666199. The next prime is 136666217. The reversal of 136666211 is 112666631.

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 136666211 - 2¹⁰ = 136665187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136666217) 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, 6212090 + ... + 6212111.

It is an arithmetic number, because the mean of its divisors is an integer number (37272606).

Almost surely, 2^136666211 is an apocalyptic number.

136666211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

136666211 is a deficient number, since it is larger than the sum of its proper divisors (12424213).

136666211 is a wasteful number, since it uses less digits than its factorization.

136666211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12424212.

The product of its digits is 7776, while the sum is 32.

The square root of 136666211 is about 11690.4324556451. The cubic root of 136666211 is about 515.0946644721.

The spelling of 136666211 in words is "one hundred thirty-six million, six hundred sixty-six thousand, two hundred eleven".