666502606 has 36 divisors (see below), whose sum is σ = 1278338544. Its totient is φ = 259671720.

The previous prime is 666502583. The next prime is 666502607. The reversal of 666502606 is 606205666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666502607) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16246 + ... + 39961.

It is an arithmetic number, because the mean of its divisors is an integer number (35509404).

Almost surely, 2^666502606 is an apocalyptic number.

666502606 is a deficient number, since it is larger than the sum of its proper divisors (611835938).

666502606 is a wasteful number, since it uses less digits than its factorization.

666502606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56245 (or 56227 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 666502606 is about 25816.7117580841. The cubic root of 666502606 is about 873.5087987605.

The spelling of 666502606 in words is "six hundred sixty-six million, five hundred two thousand, six hundred six".