136565006621 has 4 divisors (see below), whose sum is σ = 137817896700. Its totient is φ = 135312116544.

The previous prime is 136565006581. The next prime is 136565006629. The reversal of 136565006621 is 126600565631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73989984121 + 62575022500 = 272011^2 + 250150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136565006621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136565006629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626444876 + ... + 626445093.

It is an arithmetic number, because the mean of its divisors is an integer number (34454474175).

Almost surely, 2^136565006621 is an apocalyptic number.

It is an amenable number.

136565006621 is a deficient number, since it is larger than the sum of its proper divisors (1252890079).

136565006621 is a wasteful number, since it uses less digits than its factorization.

136565006621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252890078.

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 136565006621 in words is "one hundred thirty-six billion, five hundred sixty-five million, six thousand, six hundred twenty-one".