16515761668 has 12 divisors (see below), whose sum is σ = 33031523392. Its totient is φ = 7078183560.

The previous prime is 16515761663. The next prime is 16515761671. The reversal of 16515761668 is 86616751561.

It is a happy number.

16515761668 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (16515761663) 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, 294924288 + ... + 294924343.

Almost surely, 2^16515761668 is an apocalyptic number.

It is an amenable number.

16515761668 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.

16515761668 is a wasteful number, since it uses less digits than its factorization.

16515761668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589848642 (or 589848640 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 52.

The spelling of 16515761668 in words is "sixteen billion, five hundred fifteen million, seven hundred sixty-one thousand, six hundred sixty-eight".