136666201 has 4 divisors (see below), whose sum is σ = 156189952. Its totient is φ = 117142452.

The previous prime is 136666199. The next prime is 136666217. The reversal of 136666201 is 102666631.

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, and also an emirpimes, since its reverse is a distinct semiprime: 102666631 = 1231 ⋅83401.

It is not a de Polignac number, because 136666201 - 2¹ = 136666199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136666261) 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, 9761865 + ... + 9761878.

It is an arithmetic number, because the mean of its divisors is an integer number (39047488).

Almost surely, 2^136666201 is an apocalyptic number.

It is an amenable number.

136666201 is a deficient number, since it is larger than the sum of its proper divisors (19523751).

136666201 is an equidigital number, since it uses as much as digits as its factorization.

136666201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19523750.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 136666201 is about 11690.4320279449. The cubic root of 136666201 is about 515.0946519088.

The spelling of 136666201 in words is "one hundred thirty-six million, six hundred sixty-six thousand, two hundred one".