16765581516 has 12 divisors (see below), whose sum is σ = 39119690232. Its totient is φ = 5588527168.

The previous prime is 16765581487. The next prime is 16765581517. The reversal of 16765581516 is 61518556761.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (16765581517) 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, 698565885 + ... + 698565908.

It is an arithmetic number, because the mean of its divisors is an integer number (3259974186).

Almost surely, 2^16765581516 is an apocalyptic number.

It is an amenable number.

16765581516 is an abundant number, since it is smaller than the sum of its proper divisors (22354108716).

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

16765581516 is a wasteful number, since it uses less digits than its factorization.

16765581516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397131800 (or 1397131798 counting only the distinct ones).

The product of its digits is 1512000, while the sum is 51.

The spelling of 16765581516 in words is "sixteen billion, seven hundred sixty-five million, five hundred eighty-one thousand, five hundred sixteen".