663302381 has 24 divisors (see below), whose sum is σ = 789697152. Its totient is φ = 545724000.

The previous prime is 663302363. The next prime is 663302383. The reversal of 663302381 is 183203366.

663302381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 663302381 - 2¹⁸ = 663040237 is a prime.

It is a super-2 number, since 2×663302381² = 879940097280538322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663302383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1015451 + ... + 1016103.

It is an arithmetic number, because the mean of its divisors is an integer number (32904048).

Almost surely, 2^663302381 is an apocalyptic number.

It is an amenable number.

663302381 is a deficient number, since it is larger than the sum of its proper divisors (126394771).

663302381 is a wasteful number, since it uses less digits than its factorization.

663302381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873 (or 842 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 663302381 is about 25754.6574622921. The cubic root of 663302381 is about 872.1084987775.

The spelling of 663302381 in words is "six hundred sixty-three million, three hundred two thousand, three hundred eighty-one".