6781155437843 has 4 divisors (see below), whose sum is σ = 6781242936360. Its totient is φ = 6781067939328.

The previous prime is 6781155437827. The next prime is 6781155437887. The reversal of 6781155437843 is 3487345511876.

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

It is a cyclic number.

It is not a de Polignac number, because 6781155437843 - 2⁴ = 6781155437827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6781155437803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43632905 + ... + 43788042.

It is an arithmetic number, because the mean of its divisors is an integer number (1695310734090).

Almost surely, 2^{6781155437843} is an apocalyptic number.

6781155437843 is a deficient number, since it is larger than the sum of its proper divisors (87498517).

6781155437843 is an equidigital number, since it uses as much as digits as its factorization.

6781155437843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87498516.

The product of its digits is 67737600, while the sum is 62.

The spelling of 6781155437843 in words is "six trillion, seven hundred eighty-one billion, one hundred fifty-five million, four hundred thirty-seven thousand, eight hundred forty-three".