993908663 has 8 divisors (see below), whose sum is σ = 1084720896. Its totient is φ = 903172600.

The previous prime is 993908647. The next prime is 993908711. The reversal of 993908663 is 366809399.

It is a happy number.

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

It is not a de Polignac number, because 993908663 - 2⁴ = 993908647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993908603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10208 + ... + 45738.

It is an arithmetic number, because the mean of its divisors is an integer number (135590112).

Almost surely, 2^993908663 is an apocalyptic number.

993908663 is a deficient number, since it is larger than the sum of its proper divisors (90812233).

993908663 is a wasteful number, since it uses less digits than its factorization.

993908663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38085.

The product of its (nonzero) digits is 1889568, while the sum is 53.

The square root of 993908663 is about 31526.3169907301. The cubic root of 993908663 is about 997.9654176153.

The spelling of 993908663 in words is "nine hundred ninety-three million, nine hundred eight thousand, six hundred sixty-three".