1680898733 has 4 divisors (see below), whose sum is σ = 1681030428. Its totient is φ = 1680767040.

The previous prime is 1680898699. The next prime is 1680898759. The reversal of 1680898733 is 3378980861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 372412804 + 1308485929 = 19298^2 + 36173^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680898733 - 2¹⁰ = 1680897709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680898133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44366 + ... + 73007.

It is an arithmetic number, because the mean of its divisors is an integer number (420257607).

Almost surely, 2^1680898733 is an apocalyptic number.

It is an amenable number.

1680898733 is a deficient number, since it is larger than the sum of its proper divisors (131695).

1680898733 is a wasteful number, since it uses less digits than its factorization.

1680898733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131694.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 1680898733 is about 40998.7650179856. The cubic root of 1680898733 is about 1188.9963368425.

The spelling of 1680898733 in words is "one billion, six hundred eighty million, eight hundred ninety-eight thousand, seven hundred thirty-three".