205340017605 has 64 divisors (see below), whose sum is σ = 349272787968. Its totient is φ = 102657966080.

The previous prime is 205340017577. The next prime is 205340017609. The reversal of 205340017605 is 506710043502.

It is not a de Polignac number, because 205340017605 - 2⁸ = 205340017349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205340017609) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 84955357 + ... + 84957773.

It is an arithmetic number, because the mean of its divisors is an integer number (5457387312).

Almost surely, 2^205340017605 is an apocalyptic number.

It is an amenable number.

205340017605 is a deficient number, since it is larger than the sum of its proper divisors (143932770363).

205340017605 is a wasteful number, since it uses less digits than its factorization.

205340017605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646.

The product of its (nonzero) digits is 25200, while the sum is 33.

The spelling of 205340017605 in words is "two hundred five billion, three hundred forty million, seventeen thousand, six hundred five".