6981138108 has 72 divisors (see below), whose sum is σ = 20181313152. Its totient is φ = 1993267872.

The previous prime is 6981138029. The next prime is 6981138121. The reversal of 6981138108 is 8018311896.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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, 401491 + ... + 418517.

It is an arithmetic number, because the mean of its divisors is an integer number (280296016).

Almost surely, 2^6981138108 is an apocalyptic number.

It is an amenable number.

6981138108 is an abundant number, since it is smaller than the sum of its proper divisors (13200175044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6981138108 is a wasteful number, since it uses less digits than its factorization.

6981138108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18671 (or 18666 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 6981138108 is about 83553.2052527011. The cubic root of 6981138108 is about 1911.2114704938.

The spelling of 6981138108 in words is "six billion, nine hundred eighty-one million, one hundred thirty-eight thousand, one hundred eight".