16066285561 has 4 divisors (see below), whose sum is σ = 16408121472. Its totient is φ = 15724449652.

The previous prime is 16066285517. The next prime is 16066285577. The reversal of 16066285561 is 16558266061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16558266061 = 593 ⋅27922877.

It is a cyclic number.

It is not a de Polignac number, because 16066285561 - 2¹⁹ = 16065761273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16066285511) 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, 170917885 + ... + 170917978.

It is an arithmetic number, because the mean of its divisors is an integer number (4102030368).

Almost surely, 2^16066285561 is an apocalyptic number.

It is an amenable number.

16066285561 is a deficient number, since it is larger than the sum of its proper divisors (341835911).

16066285561 is an equidigital number, since it uses as much as digits as its factorization.

16066285561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341835910.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 16066285561 in words is "sixteen billion, sixty-six million, two hundred eighty-five thousand, five hundred sixty-one".