205865966 has 4 divisors (see below), whose sum is σ = 308798952. Its totient is φ = 102932982.

The previous prime is 205865951. The next prime is 205865981. The reversal of 205865966 is 669568502.

205865966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (205865951) and next prime (205865981).

It is a super-2 number, since 2×205865966² = 84761591914226312, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 205865966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51466490 + ... + 51466493.

It is an arithmetic number, because the mean of its divisors is an integer number (77199738).

Almost surely, 2^205865966 is an apocalyptic number.

205865966 is a deficient number, since it is larger than the sum of its proper divisors (102932986).

205865966 is a wasteful number, since it uses less digits than its factorization.

205865966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102932985.

The product of its (nonzero) digits is 777600, while the sum is 47.

The square root of 205865966 is about 14348.0300389984. The cubic root of 205865966 is about 590.4659404682.

The spelling of 205865966 in words is "two hundred five million, eight hundred sixty-five thousand, nine hundred sixty-six".