663221399 has 8 divisors (see below), whose sum is σ = 693456000. Its totient is φ = 633103416.

The previous prime is 663221381. The next prime is 663221423. The reversal of 663221399 is 993122366.

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 663221399 - 2¹⁶ = 663155863 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 (663221309) 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, 17417 + ... + 40370.

It is an arithmetic number, because the mean of its divisors is an integer number (86682000).

Almost surely, 2^663221399 is an apocalyptic number.

663221399 is a deficient number, since it is larger than the sum of its proper divisors (30234601).

663221399 is a wasteful number, since it uses less digits than its factorization.

663221399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58309.

The product of its digits is 104976, while the sum is 41.

The square root of 663221399 is about 25753.0852326474. The cubic root of 663221399 is about 872.0730056817.

The spelling of 663221399 in words is "six hundred sixty-three million, two hundred twenty-one thousand, three hundred ninety-nine".