666556063 has 8 divisors (see below), whose sum is σ = 671334656. Its totient is φ = 661786200.

The previous prime is 666556061. The next prime is 666556069. The reversal of 666556063 is 360655666.

It is a happy number.

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 666556063 - 2¹ = 666556061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666556061) 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, 248218 + ... + 250888.

It is an arithmetic number, because the mean of its divisors is an integer number (83916832).

Almost surely, 2^666556063 is an apocalyptic number.

666556063 is a deficient number, since it is larger than the sum of its proper divisors (4778593).

666556063 is a wasteful number, since it uses less digits than its factorization.

666556063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4365.

The product of its (nonzero) digits is 583200, while the sum is 43.

The square root of 666556063 is about 25817.7470550782. The cubic root of 666556063 is about 873.5321514631.

The spelling of 666556063 in words is "six hundred sixty-six million, five hundred fifty-six thousand, sixty-three".