16051011661 has 4 divisors (see below), whose sum is σ = 16074241024. Its totient is φ = 16027782300.

The previous prime is 16051011643. The next prime is 16051011707. The reversal of 16051011661 is 16611015061.

16051011661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 16051011661 - 2⁹ = 16051011149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16051011161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11613645 + ... + 11615026.

It is an arithmetic number, because the mean of its divisors is an integer number (4018560256).

Almost surely, 2^16051011661 is an apocalyptic number.

It is an amenable number.

16051011661 is a deficient number, since it is larger than the sum of its proper divisors (23229363).

16051011661 is an equidigital number, since it uses as much as digits as its factorization.

16051011661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23229362.

The product of its (nonzero) digits is 1080, while the sum is 28.

The spelling of 16051011661 in words is "sixteen billion, fifty-one million, eleven thousand, six hundred sixty-one".