6778699981 has 8 divisors (see below), whose sum is σ = 6856188800. Its totient is φ = 6701645808.

The previous prime is 6778699951. The next prime is 6778699987. The reversal of 6778699981 is 1899968776.

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 6778699981 - 2⁷ = 6778699853 is a prime.

It is a super-2 number, since 2×6778699981² = 91901546864818800722, 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 6778699981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6778699987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77241 + ... + 139726.

It is an arithmetic number, because the mean of its divisors is an integer number (857023600).

Almost surely, 2^6778699981 is an apocalyptic number.

It is an amenable number.

6778699981 is a deficient number, since it is larger than the sum of its proper divisors (77488819).

6778699981 is a wasteful number, since it uses less digits than its factorization.

6778699981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217323.

The product of its digits is 82301184, while the sum is 70.

The square root of 6778699981 is about 82332.8608819103. The cubic root of 6778699981 is about 1892.5562846471.

The spelling of 6778699981 in words is "six billion, seven hundred seventy-eight million, six hundred ninety-nine thousand, nine hundred eighty-one".