1681559632 has 10 divisors (see below), whose sum is σ = 3258021818. Its totient is φ = 840779808.

The previous prime is 1681559597. The next prime is 1681559657. The reversal of 1681559632 is 2369551861.

It can be written as a sum of positive squares in only one way, i.e., 1661703696 + 19855936 = 40764^2 + 4456^2 .

It is a congruent number.

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, 52548723 + ... + 52548754.

Almost surely, 2^1681559632 is an apocalyptic number.

It is an amenable number.

1681559632 is a deficient number, since it is larger than the sum of its proper divisors (1576462186).

1681559632 is a wasteful number, since it uses less digits than its factorization.

1681559632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105097485 (or 105097479 counting only the distinct ones).

The product of its digits is 388800, while the sum is 46.

The square root of 1681559632 is about 41006.8242125625. The cubic root of 1681559632 is about 1189.1521470467.

The spelling of 1681559632 in words is "one billion, six hundred eighty-one million, five hundred fifty-nine thousand, six hundred thirty-two".