136664493 has 8 divisors (see below), whose sum is σ = 208250688. Its totient is φ = 78093984.

The previous prime is 136664491. The next prime is 136664503. The reversal of 136664493 is 394466631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 136664493 - 2¹ = 136664491 is a prime.

It is a super-3 number, since 3×136664493³ (a number of 25 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136664491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3253896 + ... + 3253937.

It is an arithmetic number, because the mean of its divisors is an integer number (26031336).

Almost surely, 2^136664493 is an apocalyptic number.

It is an amenable number.

136664493 is a deficient number, since it is larger than the sum of its proper divisors (71586195).

136664493 is an equidigital number, since it uses as much as digits as its factorization.

136664493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6507843.

The product of its digits is 279936, while the sum is 42.

The square root of 136664493 is about 11690.3589765242. The cubic root of 136664493 is about 515.0925060836.

The spelling of 136664493 in words is "one hundred thirty-six million, six hundred sixty-four thousand, four hundred ninety-three".