6631078181 has 24 divisors (see below), whose sum is σ = 8562994560. Its totient is φ = 5018435136.

The previous prime is 6631078177. The next prime is 6631078189. The reversal of 6631078181 is 1818701366.

It is not a de Polignac number, because 6631078181 - 2² = 6631078177 is a prime.

It is a super-2 number, since 2×6631078181² = 87942395685068537522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) 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 (6631078189) 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 23 ways as a sum of consecutive naturals, for example, 94646 + ... + 149063.

It is an arithmetic number, because the mean of its divisors is an integer number (356791440).

Almost surely, 2^6631078181 is an apocalyptic number.

It is an amenable number.

6631078181 is a deficient number, since it is larger than the sum of its proper divisors (1931916379).

6631078181 is a wasteful number, since it uses less digits than its factorization.

6631078181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243765 (or 243752 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 6631078181 is about 81431.4323894649. The cubic root of 6631078181 is about 1878.7170760025.

The spelling of 6631078181 in words is "six billion, six hundred thirty-one million, seventy-eight thousand, one hundred eighty-one".