205664271 has 8 divisors (see below), whose sum is σ = 274543920. Its totient is φ = 136947072.

The previous prime is 205664267. The next prime is 205664273. The reversal of 205664271 is 172466502.

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

It is not a de Polignac number, because 205664271 - 2² = 205664267 is a prime.

It is a super-2 number, since 2×205664271² = 84595584731922882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205664273) 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, 37626 + ... + 42743.

It is an arithmetic number, because the mean of its divisors is an integer number (34317990).

Almost surely, 2^205664271 is an apocalyptic number.

205664271 is a deficient number, since it is larger than the sum of its proper divisors (68879649).

205664271 is an equidigital number, since it uses as much as digits as its factorization.

205664271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81225.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 205664271 is about 14340.9996513493. Note that the first 3 decimals coincide. The cubic root of 205664271 is about 590.2730432075.

The spelling of 205664271 in words is "two hundred five million, six hundred sixty-four thousand, two hundred seventy-one".