1680918619 has 16 divisors (see below), whose sum is σ = 1838397600. Its totient is φ = 1530821376.

The previous prime is 1680918599. The next prime is 1680918661. The reversal of 1680918619 is 9168190861.

It is a happy number.

It is not a de Polignac number, because 1680918619 - 2⁵ = 1680918587 is a prime.

It is a super-2 number, since 2×1680918619² = 5650974807401734322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1680918119) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 121837 + ... + 134929.

It is an arithmetic number, because the mean of its divisors is an integer number (114899850).

Almost surely, 2^1680918619 is an apocalyptic number.

1680918619 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1680918619 is a deficient number, since it is larger than the sum of its proper divisors (157478981).

1680918619 is a wasteful number, since it uses less digits than its factorization.

1680918619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13374.

The product of its (nonzero) digits is 186624, while the sum is 49.

The square root of 1680918619 is about 40999.0075367685. The cubic root of 1680918619 is about 1189.0010256612.

The spelling of 1680918619 in words is "one billion, six hundred eighty million, nine hundred eighteen thousand, six hundred nineteen".