1680529853 has 4 divisors (see below), whose sum is σ = 1721518428. Its totient is φ = 1639541280.

The previous prime is 1680529843. The next prime is 1680529859. The reversal of 1680529853 is 3589250861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3589250861 = 7 ⋅512750123.

It can be written as a sum of positive squares in 2 ways, for example, as 206123449 + 1474406404 = 14357^2 + 38398^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680529853 - 2¹² = 1680525757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1680529798 and 1680529807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680529859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20494226 + ... + 20494307.

It is an arithmetic number, because the mean of its divisors is an integer number (430379607).

Almost surely, 2^1680529853 is an apocalyptic number.

It is an amenable number.

1680529853 is a deficient number, since it is larger than the sum of its proper divisors (40988575).

1680529853 is an equidigital number, since it uses as much as digits as its factorization.

1680529853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40988574.

The product of its (nonzero) digits is 518400, while the sum is 47.

The square root of 1680529853 is about 40994.2660990534. The cubic root of 1680529853 is about 1188.9093538003.

The spelling of 1680529853 in words is "one billion, six hundred eighty million, five hundred twenty-nine thousand, eight hundred fifty-three".