6742781136857 has 18 divisors (see below), whose sum is σ = 7193473044282. Its totient is φ = 6298454290944.

The previous prime is 6742781136827. The next prime is 6742781136859. The reversal of 6742781136857 is 7586311872476.

It can be written as a sum of positive squares in 9 ways, for example, as 2603627507776 + 4139153629081 = 1613576^2 + 2034491^2 .

It is not a de Polignac number, because 6742781136857 - 2²⁰ = 6742780088281 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6742781136793 and 6742781136802.

It is not an unprimeable number, because it can be changed into a prime (6742781136859) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1466776283 + ... + 1466780879.

It is an arithmetic number, because the mean of its divisors is an integer number (399637391349).

Almost surely, 2^{6742781136857} is an apocalyptic number.

It is an amenable number.

6742781136857 is a deficient number, since it is larger than the sum of its proper divisors (450691907425).

6742781136857 is an frugal number, since it uses more digits than its factorization.

6742781136857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9485 (or 4751 counting only the distinct ones).

The product of its digits is 94832640, while the sum is 65.

The spelling of 6742781136857 in words is "six trillion, seven hundred forty-two billion, seven hundred eighty-one million, one hundred thirty-six thousand, eight hundred fifty-seven".