1681565125 has 32 divisors (see below), whose sum is σ = 2137284864. Its totient is φ = 1320696000.

The previous prime is 1681565117. The next prime is 1681565153. The reversal of 1681565125 is 5215651861.

It is not a de Polignac number, because 1681565125 - 2³ = 1681565117 is a prime.

It is a super-2 number, since 2×1681565125² = 5655322539232531250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1686127 + ... + 1687123.

It is an arithmetic number, because the mean of its divisors is an integer number (66790152).

Almost surely, 2^1681565125 is an apocalyptic number.

It is an amenable number.

1681565125 is a deficient number, since it is larger than the sum of its proper divisors (455719739).

1681565125 is a wasteful number, since it uses less digits than its factorization.

1681565125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246 (or 1236 counting only the distinct ones).

The product of its digits is 72000, while the sum is 40.

The square root of 1681565125 is about 41006.8911891648. The cubic root of 1681565125 is about 1189.1534418775.

The spelling of 1681565125 in words is "one billion, six hundred eighty-one million, five hundred sixty-five thousand, one hundred twenty-five".