205593661 has 24 divisors (see below), whose sum is σ = 271128480. Its totient is φ = 154096992.

The previous prime is 205593611. The next prime is 205593671. The reversal of 205593661 is 166395502.

It is not a de Polignac number, because 205593661 - 2¹³ = 205585469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205593661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205593601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3610 + ... + 20596.

It is an arithmetic number, because the mean of its divisors is an integer number (11297020).

Almost surely, 2^205593661 is an apocalyptic number.

It is an amenable number.

205593661 is a deficient number, since it is larger than the sum of its proper divisors (65534819).

205593661 is a wasteful number, since it uses less digits than its factorization.

205593661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17033 (or 17026 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 205593661 is about 14338.5376172049. The cubic root of 205593661 is about 590.2054833438.

The spelling of 205593661 in words is "two hundred five million, five hundred ninety-three thousand, six hundred sixty-one".