16530660561 has 8 divisors (see below), whose sum is σ = 22164014880. Its totient is φ = 10958873312.

The previous prime is 16530660547. The next prime is 16530660569. The reversal of 16530660561 is 16506603561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16530660561 - 2⁵ = 16530660529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16530660569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15391140 + ... + 15392213.

It is an arithmetic number, because the mean of its divisors is an integer number (2770501860).

Almost surely, 2^16530660561 is an apocalyptic number.

It is an amenable number.

16530660561 is a deficient number, since it is larger than the sum of its proper divisors (5633354319).

16530660561 is a wasteful number, since it uses less digits than its factorization.

16530660561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30783535.

The product of its (nonzero) digits is 97200, while the sum is 39.

The spelling of 16530660561 in words is "sixteen billion, five hundred thirty million, six hundred sixty thousand, five hundred sixty-one".