666144240611 has 4 divisors (see below), whose sum is σ = 666145999800. Its totient is φ = 666142481424.

The previous prime is 666144240589. The next prime is 666144240617. The reversal of 666144240611 is 116042441666.

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 666144240611 - 2⁶ = 666144240547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666144240617) 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, 52106 + ... + 1155423.

It is an arithmetic number, because the mean of its divisors is an integer number (166536499950).

Almost surely, 2^666144240611 is an apocalyptic number.

666144240611 is a deficient number, since it is larger than the sum of its proper divisors (1759189).

666144240611 is a wasteful number, since it uses less digits than its factorization.

666144240611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759188.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 666144240611 in words is "six hundred sixty-six billion, one hundred forty-four million, two hundred forty thousand, six hundred eleven".