6678463981 has 8 divisors (see below), whose sum is σ = 7640842880. Its totient is φ = 5718163248.

The previous prime is 6678463949. The next prime is 6678464003. The reversal of 6678463981 is 1893648766.

It is a happy number.

6678463981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6678463981 - 2⁵ = 6678463949 is a prime.

It is a super-2 number, since 2×6678463981² = 89203762291028736722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6678463921) 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, 512646 + ... + 525511.

It is an arithmetic number, because the mean of its divisors is an integer number (955105360).

Almost surely, 2^6678463981 is an apocalyptic number.

It is an amenable number.

6678463981 is a deficient number, since it is larger than the sum of its proper divisors (962378899).

6678463981 is a wasteful number, since it uses less digits than its factorization.

6678463981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039083.

The product of its digits is 10450944, while the sum is 58.

The square root of 6678463981 is about 81721.8696616762. The cubic root of 6678463981 is about 1883.1815733372.

It can be divided in two parts, 667 and 8463981, that added together give a palindrome (8464648).

The spelling of 6678463981 in words is "six billion, six hundred seventy-eight million, four hundred sixty-three thousand, nine hundred eighty-one".