6681178978 has 8 divisors (see below), whose sum is σ = 10367346780. Its totient is φ = 3225396720.

The previous prime is 6681178957. The next prime is 6681178979. The reversal of 6681178978 is 8798711866.

It can be written as a sum of positive squares in 2 ways, for example, as 6106953609 + 574225369 = 78147^2 + 23963^2 .

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

It is not an unprimeable number, because it can be changed into a prime (6681178979) 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 3 ways as a sum of consecutive naturals, for example, 57596313 + ... + 57596428.

Almost surely, 2^6681178978 is an apocalyptic number.

6681178978 is a deficient number, since it is larger than the sum of its proper divisors (3686167802).

6681178978 is a wasteful number, since it uses less digits than its factorization.

6681178978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115192772.

The product of its digits is 8128512, while the sum is 61.

The square root of 6681178978 is about 81738.4791759671. The cubic root of 6681178978 is about 1883.4367287967.

The spelling of 6681178978 in words is "six billion, six hundred eighty-one million, one hundred seventy-eight thousand, nine hundred seventy-eight".