1680942485 has 4 divisors (see below), whose sum is σ = 2017130988. Its totient is φ = 1344753984.

The previous prime is 1680942479. The next prime is 1680942517. The reversal of 1680942485 is 5842490861.

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 1096801924 + 584140561 = 33118^2 + 24169^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680942485 - 2⁶ = 1680942421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168094244 + ... + 168094253.

It is an arithmetic number, because the mean of its divisors is an integer number (504282747).

Almost surely, 2^1680942485 is an apocalyptic number.

It is an amenable number.

1680942485 is a deficient number, since it is larger than the sum of its proper divisors (336188503).

1680942485 is an equidigital number, since it uses as much as digits as its factorization.

1680942485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336188502.

The product of its (nonzero) digits is 552960, while the sum is 47.

The square root of 1680942485 is about 40999.2985915613. The cubic root of 1680942485 is about 1189.0066528549.

The spelling of 1680942485 in words is "one billion, six hundred eighty million, nine hundred forty-two thousand, four hundred eighty-five".