6776975781 has 16 divisors (see below), whose sum is σ = 10128817920. Its totient is φ = 4477999680.

The previous prime is 6776975771. The next prime is 6776975797. The reversal of 6776975781 is 1875796776.

It is not a de Polignac number, because 6776975781 - 2¹¹ = 6776973733 is a prime.

It is a super-2 number, since 2×6776975781² = 91854801472521119922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6776975771) 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 15 ways as a sum of consecutive naturals, for example, 1107565 + ... + 1113666.

It is an arithmetic number, because the mean of its divisors is an integer number (633051120).

Almost surely, 2^6776975781 is an apocalyptic number.

It is an amenable number.

6776975781 is a deficient number, since it is larger than the sum of its proper divisors (3351842139).

6776975781 is a wasteful number, since it uses less digits than its factorization.

6776975781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221353 (or 2221347 counting only the distinct ones).

The product of its digits is 31116960, while the sum is 63.

The square root of 6776975781 is about 82322.3893057047. The cubic root of 6776975781 is about 1892.3958103054.

The spelling of 6776975781 in words is "six billion, seven hundred seventy-six million, nine hundred seventy-five thousand, seven hundred eighty-one".