16005500561 has 8 divisors (see below), whose sum is σ = 16985612160. Its totient is φ = 15029679168.

The previous prime is 16005500557. The next prime is 16005500587. The reversal of 16005500561 is 16500550061.

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 16005500561 - 2² = 16005500557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16005500531) 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, 1064861 + ... + 1079786.

It is an arithmetic number, because the mean of its divisors is an integer number (2123201520).

Almost surely, 2^16005500561 is an apocalyptic number.

It is an amenable number.

16005500561 is a deficient number, since it is larger than the sum of its proper divisors (980111599).

16005500561 is a wasteful number, since it uses less digits than its factorization.

16005500561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145103.

The product of its (nonzero) digits is 4500, while the sum is 29.

The spelling of 16005500561 in words is "sixteen billion, five million, five hundred thousand, five hundred sixty-one".