6810078585421 has 4 divisors (see below), whose sum is σ = 7044908881500. Its totient is φ = 6575248289344.

The previous prime is 6810078585407. The next prime is 6810078585461. The reversal of 6810078585421 is 1245858700186.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3654925709796 + 3155152875625 = 1911786^2 + 1776275^2 .

It is a cyclic number.

It is not a de Polignac number, because 6810078585421 - 2⁷ = 6810078585293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6810078585461) 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 3 ways as a sum of consecutive naturals, for example, 117415147996 + ... + 117415148053.

It is an arithmetic number, because the mean of its divisors is an integer number (1761227220375).

Almost surely, 2^{6810078585421} is an apocalyptic number.

It is an amenable number.

6810078585421 is a deficient number, since it is larger than the sum of its proper divisors (234830296079).

6810078585421 is a wasteful number, since it uses less digits than its factorization.

6810078585421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234830296078.

The product of its (nonzero) digits is 4300800, while the sum is 55.

The spelling of 6810078585421 in words is "six trillion, eight hundred ten billion, seventy-eight million, five hundred eighty-five thousand, four hundred twenty-one".