663881181325 has 12 divisors (see below), whose sum is σ = 838744980948. Its totient is φ = 521084096000.

The previous prime is 663881181311. The next prime is 663881181391. The reversal of 663881181325 is 523181188366.

It can be written as a sum of positive squares in 6 ways, for example, as 8398256164 + 655482925161 = 91642^2 + 809619^2 .

It is a de Polignac number, because none of the positive numbers 2^k-663881181325 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250519876 + ... + 250522525.

It is an arithmetic number, because the mean of its divisors is an integer number (69895415079).

Almost surely, 2^663881181325 is an apocalyptic number.

It is an amenable number.

663881181325 is a deficient number, since it is larger than the sum of its proper divisors (174863799623).

663881181325 is a wasteful number, since it uses less digits than its factorization.

663881181325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501042464 (or 501042459 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 52.

The spelling of 663881181325 in words is "six hundred sixty-three billion, eight hundred eighty-one million, one hundred eighty-one thousand, three hundred twenty-five".