663246181 has 8 divisors (see below), whose sum is σ = 719480664. Its totient is φ = 607756800.

The previous prime is 663246179. The next prime is 663246191. The reversal of 663246181 is 181642366.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4553956 + 658692225 = 2134^2 + 25665^2 .

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 663246181 - 2¹ = 663246179 is a prime.

It is a super-2 number, since 2×663246181² = 879790993222169522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 663246181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663246121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184420 + ... + 187981.

It is an arithmetic number, because the mean of its divisors is an integer number (89935083).

Almost surely, 2^663246181 is an apocalyptic number.

It is an amenable number.

663246181 is a deficient number, since it is larger than the sum of its proper divisors (56234483).

663246181 is a wasteful number, since it uses less digits than its factorization.

663246181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372551.

The product of its digits is 41472, while the sum is 37.

The square root of 663246181 is about 25753.5663743878. The cubic root of 663246181 is about 872.0838675367.

The spelling of 663246181 in words is "six hundred sixty-three million, two hundred forty-six thousand, one hundred eighty-one".