205136645 has 16 divisors (see below), whose sum is σ = 281594880. Its totient is φ = 140532864.

The previous prime is 205136639. The next prime is 205136663. The reversal of 205136645 is 546631502.

It is a cyclic number.

It is not a de Polignac number, because 205136645 - 2¹⁶ = 205071109 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 48329 + ... + 52401.

It is an arithmetic number, because the mean of its divisors is an integer number (17599680).

Almost surely, 2^205136645 is an apocalyptic number.

It is an amenable number.

205136645 is a deficient number, since it is larger than the sum of its proper divisors (76458235).

205136645 is a wasteful number, since it uses less digits than its factorization.

205136645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5524.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 205136645 is about 14322.5921187472. The cubic root of 205136645 is about 589.7678345381.

The spelling of 205136645 in words is "two hundred five million, one hundred thirty-six thousand, six hundred forty-five".