136815667 has 4 divisors (see below), whose sum is σ = 137127760. Its totient is φ = 136503576.

The previous prime is 136815587. The next prime is 136815671. The reversal of 136815667 is 766518631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 766518631 = 23 ⋅33326897.

It is a cyclic number.

It is not a de Polignac number, because 136815667 - 2²³ = 128427059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136815697) 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, 155388 + ... + 156265.

It is an arithmetic number, because the mean of its divisors is an integer number (34281940).

Almost surely, 2^136815667 is an apocalyptic number.

136815667 is a deficient number, since it is larger than the sum of its proper divisors (312093).

136815667 is an equidigital number, since it uses as much as digits as its factorization.

136815667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312092.

The product of its digits is 181440, while the sum is 43.

The square root of 136815667 is about 11696.8229447145. The cubic root of 136815667 is about 515.2823625184.

The spelling of 136815667 in words is "one hundred thirty-six million, eight hundred fifteen thousand, six hundred sixty-seven".