6804778534985 has 16 divisors (see below), whose sum is σ = 8206896574800. Its totient is φ = 5416448951040.

The previous prime is 6804778534979. The next prime is 6804778534991. The reversal of 6804778534985 is 5894358774086.

It is an interprime number because it is at equal distance from previous prime (6804778534979) and next prime (6804778534991).

It can be written as a sum of positive squares in 8 ways, for example, as 694923971641 + 6109854563344 = 833621^2 + 2471812^2 .

It is not a de Polignac number, because 6804778534985 - 2⁶ = 6804778534921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3425042 + ... + 5033931.

It is an arithmetic number, because the mean of its divisors is an integer number (512931035925).

Almost surely, 2^{6804778534985} is an apocalyptic number.

It is an amenable number.

6804778534985 is a deficient number, since it is larger than the sum of its proper divisors (1402118039815).

6804778534985 is a wasteful number, since it uses less digits than its factorization.

6804778534985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8459788.

The product of its (nonzero) digits is 1625702400, while the sum is 74.

The spelling of 6804778534985 in words is "six trillion, eight hundred four billion, seven hundred seventy-eight million, five hundred thirty-four thousand, nine hundred eighty-five".