136664457 has 4 divisors (see below), whose sum is σ = 182219280. Its totient is φ = 91109636.

The previous prime is 136664453. The next prime is 136664491. The reversal of 136664457 is 754466631.

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.

It is a cyclic number.

It is not a de Polignac number, because 136664457 - 2² = 136664453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136664453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22777407 + ... + 22777412.

It is an arithmetic number, because the mean of its divisors is an integer number (45554820).

Almost surely, 2^136664457 is an apocalyptic number.

It is an amenable number.

136664457 is a deficient number, since it is larger than the sum of its proper divisors (45554823).

136664457 is an equidigital number, since it uses as much as digits as its factorization.

136664457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45554822.

The product of its digits is 362880, while the sum is 42.

The square root of 136664457 is about 11690.3574367938. The cubic root of 136664457 is about 515.0924608552.

The spelling of 136664457 in words is "one hundred thirty-six million, six hundred sixty-four thousand, four hundred fifty-seven".