6978405038809 has 8 divisors (see below), whose sum is σ = 7029436762728. Its totient is φ = 6927374684160.

The previous prime is 6978405038807. The next prime is 6978405038837. The reversal of 6978405038809 is 9088305048796.

It can be written as a sum of positive squares in 4 ways, for example, as 180261383184 + 6798143655625 = 424572^2 + 2607325^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6978405038809 - 2¹ = 6978405038807 is a prime.

It is a super-2 number, since 2×6978405038809² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6978405038807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11339889 + ... + 11939425.

It is an arithmetic number, because the mean of its divisors is an integer number (878679595341).

Almost surely, 2^{6978405038809} is an apocalyptic number.

It is an amenable number.

6978405038809 is a deficient number, since it is larger than the sum of its proper divisors (51031723919).

6978405038809 is a wasteful number, since it uses less digits than its factorization.

6978405038809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684635.

The product of its (nonzero) digits is 104509440, while the sum is 67.

The spelling of 6978405038809 in words is "six trillion, nine hundred seventy-eight billion, four hundred five million, thirty-eight thousand, eight hundred nine".