6978406851 has 40 divisors (see below), whose sum is σ = 11613589680. Its totient is φ = 4146303168.

The previous prime is 6978406819. The next prime is 6978406889. The reversal of 6978406851 is 1586048796.

It is not a de Polignac number, because 6978406851 - 2⁵ = 6978406819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6978406801) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 83725 + ... + 144798.

It is an arithmetic number, because the mean of its divisors is an integer number (290339742).

Almost surely, 2^6978406851 is an apocalyptic number.

6978406851 is a deficient number, since it is larger than the sum of its proper divisors (4635182829).

6978406851 is a wasteful number, since it uses less digits than its factorization.

6978406851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228577 (or 228568 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The square root of 6978406851 is about 83536.8592359086. The cubic root of 6978406851 is about 1910.9621944913.

The spelling of 6978406851 in words is "six billion, nine hundred seventy-eight million, four hundred six thousand, eight hundred fifty-one".