666066543 has 4 divisors (see below), whose sum is σ = 888088728. Its totient is φ = 444044360.

The previous prime is 666066539. The next prime is 666066553. The reversal of 666066543 is 345660666.

It is a happy number.

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 666066543 - 2² = 666066539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666066495 and 666066504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666066553) 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, 111011088 + ... + 111011093.

It is an arithmetic number, because the mean of its divisors is an integer number (222022182).

Almost surely, 2^666066543 is an apocalyptic number.

666066543 is a deficient number, since it is larger than the sum of its proper divisors (222022185).

666066543 is a wasteful number, since it uses less digits than its factorization.

666066543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222022184.

The product of its (nonzero) digits is 466560, while the sum is 42.

The square root of 666066543 is about 25808.2650133635. The cubic root of 666066543 is about 873.3182578865.

The spelling of 666066543 in words is "six hundred sixty-six million, sixty-six thousand, five hundred forty-three".