6781517080855 has 16 divisors (see below), whose sum is σ = 9066507945984. Its totient is φ = 4827075986080.

The previous prime is 6781517080817. The next prime is 6781517080867. The reversal of 6781517080855 is 5580807151876.

It is not a de Polignac number, because 6781517080855 - 2¹⁵ = 6781517048087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6781517080793 and 6781517080802.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1311702847 + ... + 1311708016.

It is an arithmetic number, because the mean of its divisors is an integer number (566656746624).

Almost surely, 2^{6781517080855} is an apocalyptic number.

6781517080855 is a deficient number, since it is larger than the sum of its proper divisors (2284990865129).

6781517080855 is a wasteful number, since it uses less digits than its factorization.

6781517080855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2623410926.

The product of its (nonzero) digits is 18816000, while the sum is 61.

The spelling of 6781517080855 in words is "six trillion, seven hundred eighty-one billion, five hundred seventeen million, eighty thousand, eight hundred fifty-five".