136668529 has 2 divisors, whose sum is σ = 136668530. Its totient is φ = 136668528.

The previous prime is 136668523. The next prime is 136668551. The reversal of 136668529 is 925866631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136258929 + 409600 = 11673^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 136668529 - 2⁷ = 136668401 is a prime.

It is not a weakly prime, because it can be changed into another prime (136668523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68334264 + 68334265.

It is an arithmetic number, because the mean of its divisors is an integer number (68334265).

Almost surely, 2^136668529 is an apocalyptic number.

It is an amenable number.

136668529 is a deficient number, since it is larger than the sum of its proper divisors (1).

136668529 is an equidigital number, since it uses as much as digits as its factorization.

136668529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 46.

The square root of 136668529 is about 11690.5315961251. The cubic root of 136668529 is about 515.0975766347.

The spelling of 136668529 in words is "one hundred thirty-six million, six hundred sixty-eight thousand, five hundred twenty-nine".