6985778211 has 6 divisors (see below), whose sum is σ = 10090568540. Its totient is φ = 4657185468.

The previous prime is 6985778209. The next prime is 6985778243. The reversal of 6985778211 is 1128775896.

6985778211 is a `hidden beast` number, since 69 + 8 + 577 + 8 + 2 + 1 + 1 = 666.

It is not a de Polignac number, because 6985778211 - 2¹ = 6985778209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6985778251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 388098781 + ... + 388098798.

Almost surely, 2^6985778211 is an apocalyptic number.

6985778211 is a deficient number, since it is larger than the sum of its proper divisors (3104790329).

6985778211 is a wasteful number, since it uses less digits than its factorization.

6985778211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776197585 (or 776197582 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 54.

The square root of 6985778211 is about 83580.9679951124. The cubic root of 6985778211 is about 1911.6348137880.

The spelling of 6985778211 in words is "six billion, nine hundred eighty-five million, seven hundred seventy-eight thousand, two hundred eleven".