663700621 has 8 divisors (see below), whose sum is σ = 706276800. Its totient is φ = 621517248.

The previous prime is 663700601. The next prime is 663700637. The reversal of 663700621 is 126007366.

663700621 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 663700621 - 2⁷ = 663700493 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 (663700601) 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, 94711 + ... + 101476.

It is an arithmetic number, because the mean of its divisors is an integer number (88284600).

Almost surely, 2^663700621 is an apocalyptic number.

It is an amenable number.

663700621 is a deficient number, since it is larger than the sum of its proper divisors (42576179).

663700621 is a wasteful number, since it uses less digits than its factorization.

663700621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196403.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 663700621 is about 25762.3877193089. The cubic root of 663700621 is about 872.2829988822.

Adding to 663700621 its reverse (126007366), we get a palindrome (789707987).

The spelling of 663700621 in words is "six hundred sixty-three million, seven hundred thousand, six hundred twenty-one".