1680506985 has 16 divisors (see below), whose sum is σ = 2690201664. Its totient is φ = 895806912.

The previous prime is 1680506981. The next prime is 1680507061. The reversal of 1680506985 is 5896050861.

It is not a de Polignac number, because 1680506985 - 2² = 1680506981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1680506981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2079 + ... + 58011.

It is an arithmetic number, because the mean of its divisors is an integer number (168137604).

Almost surely, 2^1680506985 is an apocalyptic number.

1680506985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1680506985 is a deficient number, since it is larger than the sum of its proper divisors (1009694679).

1680506985 is a wasteful number, since it uses less digits than its factorization.

1680506985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57944.

The product of its (nonzero) digits is 518400, while the sum is 48.

The square root of 1680506985 is about 40993.9871810489. The cubic root of 1680506985 is about 1188.9039610363.

The spelling of 1680506985 in words is "one billion, six hundred eighty million, five hundred six thousand, nine hundred eighty-five".