1681682650 has 24 divisors (see below), whose sum is σ = 3204224604. Its totient is φ = 656265600.

The previous prime is 1681682603. The next prime is 1681682663. The reversal of 1681682650 is 562861861.

It can be written as a sum of positive squares in 6 ways, for example, as 332369361 + 1349313289 = 18231^2 + 36733^2 .

It is a super-2 number, since 2×1681682650² = 5656113070622045000, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1681682597 and 1681682606.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 408117 + ... + 412216.

Almost surely, 2^1681682650 is an apocalyptic number.

1681682650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1681682650 is a deficient number, since it is larger than the sum of its proper divisors (1522541954).

1681682650 is a wasteful number, since it uses less digits than its factorization.

1681682650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820386 (or 820381 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 1681682650 is about 41008.3241549810. The cubic root of 1681682650 is about 1189.1811446409.

The spelling of 1681682650 in words is "one billion, six hundred eighty-one million, six hundred eighty-two thousand, six hundred fifty".