666285911 has 4 divisors (see below), whose sum is σ = 666352632. Its totient is φ = 666219192.

The previous prime is 666285889. The next prime is 666285929. The reversal of 666285911 is 119582666.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 666285911 - 2⁶ = 666285847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666285611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15020 + ... + 39473.

It is an arithmetic number, because the mean of its divisors is an integer number (166588158).

Almost surely, 2^666285911 is an apocalyptic number.

666285911 is a deficient number, since it is larger than the sum of its proper divisors (66721).

666285911 is a wasteful number, since it uses less digits than its factorization.

666285911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66720.

The product of its digits is 155520, while the sum is 44.

The square root of 666285911 is about 25812.5146198506. The cubic root of 666285911 is about 873.4141227083.

The spelling of 666285911 in words is "six hundred sixty-six million, two hundred eighty-five thousand, nine hundred eleven".