1881665716 has 12 divisors (see below), whose sum is σ = 3763331488. Its totient is φ = 806428152.

The previous prime is 1881665711. The next prime is 1881665789. The reversal of 1881665716 is 6175661881.

It is a happy number.

1881665716 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1881665716.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881665711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33601146 + ... + 33601201.

Almost surely, 2^1881665716 is an apocalyptic number.

It is an amenable number.

1881665716 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1881665716 is a wasteful number, since it uses less digits than its factorization.

1881665716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67202358 (or 67202356 counting only the distinct ones).

The product of its digits is 483840, while the sum is 49.

The square root of 1881665716 is about 43378.1709619020. The cubic root of 1881665716 is about 1234.5655595745.

The spelling of 1881665716 in words is "one billion, eight hundred eighty-one million, six hundred sixty-five thousand, seven hundred sixteen".