136643521665331 has 2 divisors, whose sum is σ = 136643521665332. Its totient is φ = 136643521665330.

The previous prime is 136643521665253. The next prime is 136643521665349. The reversal of 136643521665331 is 133566125346631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136643521665331 - 2⁴¹ = 134444498409779 is a prime.

It is a super-2 number, since 2×136643521665331² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (136643521665361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68321760832665 + 68321760832666.

It is an arithmetic number, because the mean of its divisors is an integer number (68321760832666).

Almost surely, 2^{136643521665331} is an apocalyptic number.

136643521665331 is a deficient number, since it is larger than the sum of its proper divisors (1).

136643521665331 is an equidigital number, since it uses as much as digits as its factorization.

136643521665331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20995200, while the sum is 55.

The spelling of 136643521665331 in words is "one hundred thirty-six trillion, six hundred forty-three billion, five hundred twenty-one million, six hundred sixty-five thousand, three hundred thirty-one".