1680016686 has 16 divisors (see below), whose sum is σ = 3402566400. Its totient is φ = 552916728.

The previous prime is 1680016643. The next prime is 1680016691. The reversal of 1680016686 is 6866100861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1771696 + ... + 1772643.

It is an arithmetic number, because the mean of its divisors is an integer number (212660400).

Almost surely, 2^1680016686 is an apocalyptic number.

1680016686 is an abundant number, since it is smaller than the sum of its proper divisors (1722549714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1680016686 is a wasteful number, since it uses less digits than its factorization.

1680016686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3544423.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 1680016686 is about 40988.0066116907. The cubic root of 1680016686 is about 1188.7883262651.

The spelling of 1680016686 in words is "one billion, six hundred eighty million, sixteen thousand, six hundred eighty-six".