1681165437 has 16 divisors (see below), whose sum is σ = 2569867392. Its totient is φ = 957631680.

The previous prime is 1681165417. The next prime is 1681165439. The reversal of 1681165437 is 7345611861.

It is not a de Polignac number, because 1681165437 - 2²⁰ = 1680116861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681165439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119614 + ... + 132927.

It is an arithmetic number, because the mean of its divisors is an integer number (160616712).

Almost surely, 2^1681165437 is an apocalyptic number.

It is an amenable number.

1681165437 is a deficient number, since it is larger than the sum of its proper divisors (888701955).

1681165437 is a wasteful number, since it uses less digits than its factorization.

1681165437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252868.

The product of its digits is 120960, while the sum is 42.

The square root of 1681165437 is about 41002.0174747536. The cubic root of 1681165437 is about 1189.0592185424.

The spelling of 1681165437 in words is "one billion, six hundred eighty-one million, one hundred sixty-five thousand, four hundred thirty-seven".