1686119645 has 24 divisors (see below), whose sum is σ = 2363867064. Its totient is φ = 1151195136.

The previous prime is 1686119621. The next prime is 1686119647. The reversal of 1686119645 is 5469116861.

It can be written as a sum of positive squares in 4 ways, for example, as 72812089 + 1613307556 = 8533^2 + 40166^2 .

It is not a de Polignac number, because 1686119645 - 2¹⁶ = 1686054109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1686119645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686119647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42317 + ... + 71853.

It is an arithmetic number, because the mean of its divisors is an integer number (98494461).

Almost surely, 2^1686119645 is an apocalyptic number.

It is an amenable number.

1686119645 is a deficient number, since it is larger than the sum of its proper divisors (677747419).

1686119645 is a wasteful number, since it uses less digits than its factorization.

1686119645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29789 (or 29782 counting only the distinct ones).

The product of its digits is 311040, while the sum is 47.

The square root of 1686119645 is about 41062.3872296777. The cubic root of 1686119645 is about 1190.2260816127.

The spelling of 1686119645 in words is "one billion, six hundred eighty-six million, one hundred nineteen thousand, six hundred forty-five".