1680045349 has 8 divisors (see below), whose sum is σ = 1779337368. Its totient is φ = 1580805120.

The previous prime is 1680045343. The next prime is 1680045431. The reversal of 1680045349 is 9435400861.

It can be written as a sum of positive squares in 4 ways, for example, as 569156449 + 1110888900 = 23857^2 + 33330^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1680045349 - 2¹¹ = 1680043301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680045343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68559 + ... + 89779.

It is an arithmetic number, because the mean of its divisors is an integer number (222417171).

Almost surely, 2^1680045349 is an apocalyptic number.

It is an amenable number.

1680045349 is a deficient number, since it is larger than the sum of its proper divisors (99292019).

1680045349 is a wasteful number, since it uses less digits than its factorization.

1680045349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25895.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 1680045349 is about 40988.3562612603. The cubic root of 1680045349 is about 1188.7950869213.

The spelling of 1680045349 in words is "one billion, six hundred eighty million, forty-five thousand, three hundred forty-nine".