205652661 has 8 divisors (see below), whose sum is σ = 274380000. Its totient is φ = 137013552.

The previous prime is 205652653. The next prime is 205652663. The reversal of 205652661 is 166256502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205652661 - 2³ = 205652653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205652663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16411 + ... + 26088.

It is an arithmetic number, because the mean of its divisors is an integer number (34297500).

Almost surely, 2^205652661 is an apocalyptic number.

It is an amenable number.

205652661 is a deficient number, since it is larger than the sum of its proper divisors (68727339).

205652661 is a wasteful number, since it uses less digits than its factorization.

205652661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44115.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 205652661 is about 14340.5948621387. The cubic root of 205652661 is about 590.2619357864.

The spelling of 205652661 in words is "two hundred five million, six hundred fifty-two thousand, six hundred sixty-one".