1680166989 has 16 divisors (see below), whose sum is σ = 2489771200. Its totient is φ = 1119825648.

The previous prime is 1680166987. The next prime is 1680167011. The reversal of 1680166989 is 9896610861.

It is not a de Polignac number, because 1680166989 - 2¹ = 1680166987 is a prime.

It is a super-2 number, since 2×1680166989² = 5645922221850652242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680166987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186462 + ... + 195264.

It is an arithmetic number, because the mean of its divisors is an integer number (155610700).

Almost surely, 2^1680166989 is an apocalyptic number.

It is an amenable number.

1680166989 is a deficient number, since it is larger than the sum of its proper divisors (809604211).

1680166989 is an equidigital number, since it uses as much as digits as its factorization.

1680166989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15881 (or 15875 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 1680166989 is about 40989.8400704370. The cubic root of 1680166989 is about 1188.8237769295.

The spelling of 1680166989 in words is "one billion, six hundred eighty million, one hundred sixty-six thousand, nine hundred eighty-nine".