16066661605961 has 8 divisors (see below), whose sum is σ = 16765487116224. Its totient is φ = 15367859012880.

The previous prime is 16066661605937. The next prime is 16066661606033. The reversal of 16066661605961 is 16950616666061.

16066661605961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 16066661605961 - 2¹⁰ = 16066661604937 is a prime.

It is a super-2 number, since 2×16066661605961² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16066661605961.

It is not an unprimeable number, because it can be changed into a prime (16066661605061) 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, 4288946 + ... + 7108331.

It is an arithmetic number, because the mean of its divisors is an integer number (2095685889528).

Almost surely, 2^{16066661605961} is an apocalyptic number.

It is an amenable number.

16066661605961 is a deficient number, since it is larger than the sum of its proper divisors (698825510263).

16066661605961 is a wasteful number, since it uses less digits than its factorization.

16066661605961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11458591.

The product of its (nonzero) digits is 12597120, while the sum is 59.

The spelling of 16066661605961 in words is "sixteen trillion, sixty-six billion, six hundred sixty-one million, six hundred five thousand, nine hundred sixty-one".