16021530561 has 8 divisors (see below), whose sum is σ = 21371472864. Its totient is φ = 10676304320.

The previous prime is 16021530557. The next prime is 16021530611. The reversal of 16021530561 is 16503512061.

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 16021530561 - 2² = 16021530557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16021530461) 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, 1171080 + ... + 1184681.

It is an arithmetic number, because the mean of its divisors is an integer number (2671434108).

Almost surely, 2^16021530561 is an apocalyptic number.

It is an amenable number.

16021530561 is a deficient number, since it is larger than the sum of its proper divisors (5349942303).

16021530561 is a wasteful number, since it uses less digits than its factorization.

16021530561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358031.

The product of its (nonzero) digits is 5400, while the sum is 30.

The spelling of 16021530561 in words is "sixteen billion, twenty-one million, five hundred thirty thousand, five hundred sixty-one".