663998493 has 8 divisors (see below), whose sum is σ = 887608800. Its totient is φ = 441526928.

The previous prime is 663998459. The next prime is 663998501. The reversal of 663998493 is 394899366.

663998493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 663998493 - 2⁶ = 663998429 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663998693) 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, 283323 + ... + 285656.

It is an arithmetic number, because the mean of its divisors is an integer number (110951100).

Almost surely, 2^663998493 is an apocalyptic number.

It is an amenable number.

663998493 is a deficient number, since it is larger than the sum of its proper divisors (223610307).

663998493 is a wasteful number, since it uses less digits than its factorization.

663998493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569371.

The product of its digits is 7558272, while the sum is 57.

The square root of 663998493 is about 25768.1682119626. The cubic root of 663998493 is about 872.4134742864.

The spelling of 663998493 in words is "six hundred sixty-three million, nine hundred ninety-eight thousand, four hundred ninety-three".