6851149778 has 16 divisors (see below), whose sum is σ = 11227411296. Its totient is φ = 3109592640.

The previous prime is 6851149763. The next prime is 6851149801. The reversal of 6851149778 is 8779411586.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212951 + ... + 243002.

It is an arithmetic number, because the mean of its divisors is an integer number (701713206).

Almost surely, 2^6851149778 is an apocalyptic number.

6851149778 is a deficient number, since it is larger than the sum of its proper divisors (4376261518).

6851149778 is a wasteful number, since it uses less digits than its factorization.

6851149778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456649.

The product of its digits is 3386880, while the sum is 56.

The square root of 6851149778 is about 82771.6725577054. The cubic root of 6851149778 is about 1899.2748643765.

The spelling of 6851149778 in words is "six billion, eight hundred fifty-one million, one hundred forty-nine thousand, seven hundred seventy-eight".