1681559372 has 12 divisors (see below), whose sum is σ = 2964209640. Its totient is φ = 834642336.

The previous prime is 1681559309. The next prime is 1681559393. The reversal of 1681559372 is 2739551861.

It is a super-2 number, since 2×1681559372² = 5655283843122068768, which contains 22 as substring.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1533722 + ... + 1534817.

It is an arithmetic number, because the mean of its divisors is an integer number (247017470).

Almost surely, 2^1681559372 is an apocalyptic number.

It is an amenable number.

1681559372 is a deficient number, since it is larger than the sum of its proper divisors (1282650268).

1681559372 is a wasteful number, since it uses less digits than its factorization.

1681559372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3068680 (or 3068678 counting only the distinct ones).

The product of its digits is 453600, while the sum is 47.

The square root of 1681559372 is about 41006.8210423583. The cubic root of 1681559372 is about 1189.1520857584.

The spelling of 1681559372 in words is "one billion, six hundred eighty-one million, five hundred fifty-nine thousand, three hundred seventy-two".