993666646 has 8 divisors (see below), whose sum is σ = 1703428560. Its totient is φ = 425857128.

The previous prime is 993666601. The next prime is 993666649. The reversal of 993666646 is 646666399.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993666649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35488081 + ... + 35488108.

It is an arithmetic number, because the mean of its divisors is an integer number (212928570).

Almost surely, 2^993666646 is an apocalyptic number.

993666646 is a deficient number, since it is larger than the sum of its proper divisors (709761914).

993666646 is a wasteful number, since it uses less digits than its factorization.

993666646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70976198.

The product of its digits is 7558272, while the sum is 55.

The square root of 993666646 is about 31522.4784241341. The cubic root of 993666646 is about 997.8844094328.

The spelling of 993666646 in words is "nine hundred ninety-three million, six hundred sixty-six thousand, six hundred forty-six".