663904073281 has 8 divisors (see below), whose sum is σ = 671390791200. Its totient is φ = 656417958240.

The previous prime is 663904073279. The next prime is 663904073333. The reversal of 663904073281 is 182370409366.

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 663904073281 - 2¹ = 663904073279 is a prime.

It is a super-2 number, since 2×663904073281² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663904073251) 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 7 ways as a sum of consecutive naturals, for example, 2284710 + ... + 2558848.

It is an arithmetic number, because the mean of its divisors is an integer number (83923848900).

Almost surely, 2^663904073281 is an apocalyptic number.

It is an amenable number.

663904073281 is a deficient number, since it is larger than the sum of its proper divisors (7486717919).

663904073281 is a wasteful number, since it uses less digits than its factorization.

663904073281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301439.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The spelling of 663904073281 in words is "six hundred sixty-three billion, nine hundred four million, seventy-three thousand, two hundred eighty-one".