666023636 has 12 divisors (see below), whose sum is σ = 1169064960. Its totient is φ = 332005080.

The previous prime is 666023563. The next prime is 666023653. The reversal of 666023636 is 636320666.

It is a self number, because there is not a number n which added to its sum of digits gives 666023636.

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, 250196 + ... + 252843.

It is an arithmetic number, because the mean of its divisors is an integer number (97422080).

Almost surely, 2^666023636 is an apocalyptic number.

It is an amenable number.

666023636 is a deficient number, since it is larger than the sum of its proper divisors (503041324).

666023636 is a wasteful number, since it uses less digits than its factorization.

666023636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503374 (or 503372 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 38.

The square root of 666023636 is about 25807.4337352632. The cubic root of 666023636 is about 873.2995048697.

The spelling of 666023636 in words is "six hundred sixty-six million, twenty-three thousand, six hundred thirty-six".