666506366 has 8 divisors (see below), whose sum is σ = 1000431000. Its totient is φ = 333029368.

The previous prime is 666506359. The next prime is 666506371. The reversal of 666506366 is 663605666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108161 + ... + 114156.

It is an arithmetic number, because the mean of its divisors is an integer number (125053875).

Almost surely, 2^666506366 is an apocalyptic number.

666506366 is a deficient number, since it is larger than the sum of its proper divisors (333924634).

666506366 is a wasteful number, since it uses less digits than its factorization.

666506366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223818.

The product of its (nonzero) digits is 699840, while the sum is 44.

The square root of 666506366 is about 25816.7845790292. The cubic root of 666506366 is about 873.5104413582.

The spelling of 666506366 in words is "six hundred sixty-six million, five hundred six thousand, three hundred sixty-six".