136664261 has 8 divisors (see below), whose sum is σ = 137829720. Its totient is φ = 135502848.

The previous prime is 136664257. The next prime is 136664287. The reversal of 136664261 is 162466631.

It can be written as a sum of positive squares in 4 ways, for example, as 13032100 + 123632161 = 3610^2 + 11119^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 136664261 - 2² = 136664257 is a prime.

It is a super-2 number, since 2×136664261² = 37354240469352242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136664201) 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 7 ways as a sum of consecutive naturals, for example, 145385 + ... + 146321.

It is an arithmetic number, because the mean of its divisors is an integer number (17228715).

Almost surely, 2^136664261 is an apocalyptic number.

It is an amenable number.

136664261 is a deficient number, since it is larger than the sum of its proper divisors (1165459).

136664261 is an equidigital number, since it uses as much as digits as its factorization.

136664261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023.

The product of its digits is 31104, while the sum is 35.

The square root of 136664261 is about 11690.3490538136. The cubic root of 136664261 is about 515.0922146118.

The spelling of 136664261 in words is "one hundred thirty-six million, six hundred sixty-four thousand, two hundred sixty-one".