663120447 has 16 divisors (see below), whose sum is σ = 980353920. Its totient is φ = 395301600.

The previous prime is 663120443. The next prime is 663120457. The reversal of 663120447 is 744021366.

It is a happy number.

It is not a de Polignac number, because 663120447 - 2² = 663120443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663120443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162697 + ... + 166722.

It is an arithmetic number, because the mean of its divisors is an integer number (61272120).

Almost surely, 2^663120447 is an apocalyptic number.

663120447 is a deficient number, since it is larger than the sum of its proper divisors (317233473).

663120447 is a wasteful number, since it uses less digits than its factorization.

663120447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329494.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 663120447 is about 25751.1251598838. The cubic root of 663120447 is about 872.0287560131.

It can be divided in two parts, 66 and 3120447, that multiplied together give a palindrome (205949502).

The spelling of 663120447 in words is "six hundred sixty-three million, one hundred twenty thousand, four hundred forty-seven".