1725681616 has 20 divisors (see below), whose sum is σ = 3344168772. Its totient is φ = 862670336.

The previous prime is 1725681599. The next prime is 1725681637. The reversal of 1725681616 is 6161865271.

It can be written as a sum of positive squares in 2 ways, for example, as 1241857600 + 483824016 = 35240^2 + 21996^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125850 + ... + 138886.

Almost surely, 2^1725681616 is an apocalyptic number.

1725681616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1725681616 is a deficient number, since it is larger than the sum of its proper divisors (1618487156).

1725681616 is a wasteful number, since it uses less digits than its factorization.

1725681616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21318 (or 21312 counting only the distinct ones).

The product of its digits is 120960, while the sum is 43.

The square root of 1725681616 is about 41541.3241965155. The cubic root of 1725681616 is about 1199.4630968520.

The spelling of 1725681616 in words is "one billion, seven hundred twenty-five million, six hundred eighty-one thousand, six hundred sixteen".