666151111 has 4 divisors (see below), whose sum is σ = 674177112. Its totient is φ = 658125112.

The previous prime is 666151099. The next prime is 666151151. The reversal of 666151111 is 111151666.

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

It is a cyclic number.

It is not a de Polignac number, because 666151111 - 2⁷ = 666150983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666151111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666151151) 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, 4012876 + ... + 4013041.

It is an arithmetic number, because the mean of its divisors is an integer number (168544278).

Almost surely, 2^666151111 is an apocalyptic number.

666151111 is a deficient number, since it is larger than the sum of its proper divisors (8026001).

666151111 is an equidigital number, since it uses as much as digits as its factorization.

666151111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8026000.

The product of its digits is 1080, while the sum is 28.

The square root of 666151111 is about 25809.9033512332. The cubic root of 666151111 is about 873.3552169830.

The spelling of 666151111 in words is "six hundred sixty-six million, one hundred fifty-one thousand, one hundred eleven".