1680080661 has 12 divisors (see below), whose sum is σ = 2773466592. Its totient is φ = 960046056.

The previous prime is 1680080653. The next prime is 1680080671. The reversal of 1680080661 is 1660800861.

It is not a de Polignac number, because 1680080661 - 2³ = 1680080653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680080651) 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 11 ways as a sum of consecutive naturals, for example, 13333911 + ... + 13334036.

It is an arithmetic number, because the mean of its divisors is an integer number (231122216).

Almost surely, 2^1680080661 is an apocalyptic number.

It is an amenable number.

1680080661 is a deficient number, since it is larger than the sum of its proper divisors (1093385931).

1680080661 is a wasteful number, since it uses less digits than its factorization.

1680080661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26667960 (or 26667957 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1680080661 is about 40988.7870154753. The cubic root of 1680080661 is about 1188.8034157517.

It can be divided in two parts, 16800 and 80661, that added together give a triangular number (97461 = T₄₄₁).

The spelling of 1680080661 in words is "one billion, six hundred eighty million, eighty thousand, six hundred sixty-one".