1686705056 has 12 divisors (see below), whose sum is σ = 3320700642. Its totient is φ = 843352512.

The previous prime is 1686705049. The next prime is 1686705089. The reversal of 1686705056 is 6505076861.

It can be written as a sum of positive squares in only one way, i.e., 1685923600 + 781456 = 41060^2 + 884^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1686704998 and 1686705016.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26354735 + ... + 26354798.

Almost surely, 2^1686705056 is an apocalyptic number.

1686705056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1686705056 is a deficient number, since it is larger than the sum of its proper divisors (1633995586).

1686705056 is an equidigital number, since it uses as much as digits as its factorization.

1686705056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52709543 (or 52709535 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 1686705056 is about 41069.5149228719. The cubic root of 1686705056 is about 1190.3638122141.

The spelling of 1686705056 in words is "one billion, six hundred eighty-six million, seven hundred five thousand, fifty-six".