205440655 has 16 divisors (see below), whose sum is σ = 286525440. Its totient is φ = 138484512.

The previous prime is 205440649. The next prime is 205440659. The reversal of 205440655 is 556044502.

It is a cyclic number.

It is not a de Polignac number, because 205440655 - 2³ = 205440647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205440659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47679 + ... + 51808.

It is an arithmetic number, because the mean of its divisors is an integer number (17907840).

Almost surely, 2^205440655 is an apocalyptic number.

205440655 is a deficient number, since it is larger than the sum of its proper divisors (81084785).

205440655 is an equidigital number, since it uses as much as digits as its factorization.

205440655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99558.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 205440655 is about 14333.2011428013. The cubic root of 205440655 is about 590.0590336411.

The spelling of 205440655 in words is "two hundred five million, four hundred forty thousand, six hundred fifty-five".