663141181 has 4 divisors (see below), whose sum is σ = 684532864. Its totient is φ = 641749500.

The previous prime is 663141169. The next prime is 663141197. The reversal of 663141181 is 181141366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 663141181 - 2²⁹ = 126270269 is a prime.

It is a super-2 number, since 2×663141181² = 879512451876149522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 21391651 = 663141181 / (6 + 6 + 3 + 1 + 4 + 1 + 1 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663141161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10695795 + ... + 10695856.

It is an arithmetic number, because the mean of its divisors is an integer number (171133216).

Almost surely, 2^663141181 is an apocalyptic number.

It is an amenable number.

663141181 is a deficient number, since it is larger than the sum of its proper divisors (21391683).

663141181 is a wasteful number, since it uses less digits than its factorization.

663141181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21391682.

The product of its digits is 3456, while the sum is 31.

The square root of 663141181 is about 25751.5277410875. The cubic root of 663141181 is about 872.0378445861.

The spelling of 663141181 in words is "six hundred sixty-three million, one hundred forty-one thousand, one hundred eighty-one".