1686286561826 has 4 divisors (see below), whose sum is σ = 2529429842742. Its totient is φ = 843143280912.

The previous prime is 1686286561807. The next prime is 1686286561877. The reversal of 1686286561826 is 6281656826861.

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

It can be written as a sum of positive squares in only one way, i.e., 1663586619601 + 22699942225 = 1289801^2 + 150665^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 421571640455 + ... + 421571640458.

Almost surely, 2^{1686286561826} is an apocalyptic number.

1686286561826 is a deficient number, since it is larger than the sum of its proper divisors (843143280916).

1686286561826 is an equidigital number, since it uses as much as digits as its factorization.

1686286561826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843143280915.

The product of its digits is 79626240, while the sum is 65.

The spelling of 1686286561826 in words is "one trillion, six hundred eighty-six billion, two hundred eighty-six million, five hundred sixty-one thousand, eight hundred twenty-six".