565011666 has 16 divisors (see below), whose sum is σ = 1255581600. Its totient is φ = 188337204.

The previous prime is 565011661. The next prime is 565011679. The reversal of 565011666 is 666110565.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 565011666.

It is not an unprimeable number, because it can be changed into a prime (565011661) 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, 5231536 + ... + 5231643.

It is an arithmetic number, because the mean of its divisors is an integer number (78473850).

Almost surely, 2^565011666 is an apocalyptic number.

565011666 is an abundant number, since it is smaller than the sum of its proper divisors (690569934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

565011666 is a wasteful number, since it uses less digits than its factorization.

565011666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10463190 (or 10463184 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 565011666 is about 23769.9740428971. The cubic root of 565011666 is about 826.7086307681.

The spelling of 565011666 in words is "five hundred sixty-five million, eleven thousand, six hundred sixty-six".