205565001 has 8 divisors (see below), whose sum is σ = 275671680. Its totient is φ = 136250832.

The previous prime is 205564993. The next prime is 205565011. The reversal of 205565001 is 100565502.

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

It is not a de Polignac number, because 205565001 - 2³ = 205564993 is a prime.

It is a super-2 number, since 2×205565001² = 84513939272260002, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (205565011) 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, 197521 + ... + 198558.

It is an arithmetic number, because the mean of its divisors is an integer number (34458960).

Almost surely, 2^205565001 is an apocalyptic number.

It is an amenable number.

205565001 is a deficient number, since it is larger than the sum of its proper divisors (70106679).

205565001 is a wasteful number, since it uses less digits than its factorization.

205565001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396255.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 205565001 is about 14337.5381778044. The cubic root of 205565001 is about 590.1780569547.

The spelling of 205565001 in words is "two hundred five million, five hundred sixty-five thousand, one".