663874666 has 32 divisors (see below), whose sum is σ = 1231090560. Its totient is φ = 261458496.

The previous prime is 663874621. The next prime is 663874727. The reversal of 663874666 is 666478366.

It is a super-2 number, since 2×663874666² = 881459144313223112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33280 + ... + 49348.

It is an arithmetic number, because the mean of its divisors is an integer number (38471580).

Almost surely, 2^663874666 is an apocalyptic number.

663874666 is a deficient number, since it is larger than the sum of its proper divisors (567215894).

663874666 is a wasteful number, since it uses less digits than its factorization.

663874666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16318.

The product of its digits is 5225472, while the sum is 52.

The square root of 663874666 is about 25765.7653874283. The cubic root of 663874666 is about 872.3592396958.

The spelling of 663874666 in words is "six hundred sixty-three million, eight hundred seventy-four thousand, six hundred sixty-six".