666506486 has 8 divisors (see below), whose sum is σ = 1014681720. Its totient is φ = 328279248.

The previous prime is 666506461. The next prime is 666506509. The reversal of 666506486 is 684605666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 666506486.

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, 2486831 + ... + 2487098.

It is an arithmetic number, because the mean of its divisors is an integer number (126835215).

Almost surely, 2^666506486 is an apocalyptic number.

666506486 is a deficient number, since it is larger than the sum of its proper divisors (348175234).

666506486 is a wasteful number, since it uses less digits than its factorization.

666506486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4973998.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The square root of 666506486 is about 25816.7869030985. The cubic root of 666506486 is about 873.5104937814.

The spelling of 666506486 in words is "six hundred sixty-six million, five hundred six thousand, four hundred eighty-six".