660666143 has 4 divisors (see below), whose sum is σ = 665709528. Its totient is φ = 655622760.

The previous prime is 660666131. The next prime is 660666161. The reversal of 660666143 is 341666066.

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 660666143 - 2¹⁰ = 660665119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 660666097 and 660666106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660666103) 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, 2521496 + ... + 2521757.

It is an arithmetic number, because the mean of its divisors is an integer number (166427382).

Almost surely, 2^660666143 is an apocalyptic number.

660666143 is a deficient number, since it is larger than the sum of its proper divisors (5043385).

660666143 is a wasteful number, since it uses less digits than its factorization.

660666143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5043384.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 660666143 is about 25703.4266781688. The cubic root of 660666143 is about 870.9515914540.

The spelling of 660666143 in words is "six hundred sixty million, six hundred sixty-six thousand, one hundred forty-three".