666554143 has 8 divisors (see below), whose sum is σ = 702193520. Its totient is φ = 630970560.

The previous prime is 666554111. The next prime is 666554209. The reversal of 666554143 is 341455666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666554143 - 2⁵ = 666554111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666554096 and 666554105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666554243) 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, 11821 + ... + 38377.

It is an arithmetic number, because the mean of its divisors is an integer number (87774190).

Almost surely, 2^666554143 is an apocalyptic number.

666554143 is a deficient number, since it is larger than the sum of its proper divisors (35639377).

666554143 is a wasteful number, since it uses less digits than its factorization.

666554143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27897.

The product of its digits is 259200, while the sum is 40.

The square root of 666554143 is about 25817.7098713267. The cubic root of 666554143 is about 873.5313127323.

The spelling of 666554143 in words is "six hundred sixty-six million, five hundred fifty-four thousand, one hundred forty-three".