663347257728 has 128 divisors (see below), whose sum is σ = 1829721247200. Its totient is φ = 212767211520.

The previous prime is 663347257723. The next prime is 663347257873. The reversal of 663347257728 is 827752743366.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663347257721) 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, 860728 + ... + 1437896.

Almost surely, 2^663347257728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663347257728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (914860623600).

663347257728 is an abundant number, since it is smaller than the sum of its proper divisors (1166373989472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663347257728 is a wasteful number, since it uses less digits than its factorization.

663347257728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577300 (or 577288 counting only the distinct ones).

The product of its digits is 71124480, while the sum is 60.

The spelling of 663347257728 in words is "six hundred sixty-three billion, three hundred forty-seven million, two hundred fifty-seven thousand, seven hundred twenty-eight".