136666817 has 16 divisors (see below), whose sum is σ = 165172224. Its totient is φ = 110592000.

The previous prime is 136666813. The next prime is 136666819. The reversal of 136666817 is 718666631.

It is a cyclic number.

It is not a de Polignac number, because 136666817 - 2² = 136666813 is a prime.

It is a super-2 number, since 2×136666817² = 37355637737822978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (136666813) 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, 1217 + ... + 16577.

It is an arithmetic number, because the mean of its divisors is an integer number (10323264).

Almost surely, 2^136666817 is an apocalyptic number.

It is an amenable number.

136666817 is a deficient number, since it is larger than the sum of its proper divisors (28505407).

136666817 is a wasteful number, since it uses less digits than its factorization.

136666817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15440.

The product of its digits is 217728, while the sum is 44.

The square root of 136666817 is about 11690.4583742469. The cubic root of 136666817 is about 515.0954258086.

The spelling of 136666817 in words is "one hundred thirty-six million, six hundred sixty-six thousand, eight hundred seventeen".