205455645 has 48 divisors (see below), whose sum is σ = 378668160. Its totient is φ = 102757248.

The previous prime is 205455643. The next prime is 205455661. The reversal of 205455645 is 546554502.

205455645 is a `hidden beast` number, since 2 + 0 + 5 + 4 + 5 + 5 + 645 = 666.

It is not a de Polignac number, because 205455645 - 2¹ = 205455643 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205455643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 86899 + ... + 89231.

It is an arithmetic number, because the mean of its divisors is an integer number (7888920).

Almost surely, 2^205455645 is an apocalyptic number.

It is an amenable number.

205455645 is a deficient number, since it is larger than the sum of its proper divisors (173212515).

205455645 is a wasteful number, since it uses less digits than its factorization.

205455645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2466 (or 2463 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

The square root of 205455645 is about 14333.7240450624. The cubic root of 205455645 is about 590.0733845328.

The spelling of 205455645 in words is "two hundred five million, four hundred fifty-five thousand, six hundred forty-five".