16661566051 has 16 divisors (see below), whose sum is σ = 18895340800. Its totient is φ = 14564471328.

The previous prime is 16661566049. The next prime is 16661566087. The reversal of 16661566051 is 15066516661.

16661566051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16661566051 - 2¹ = 16661566049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16661565989 and 16661566007.

It is not an unprimeable number, because it can be changed into a prime (16661566351) 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 15 ways as a sum of consecutive naturals, for example, 656170 + ... + 681088.

It is an arithmetic number, because the mean of its divisors is an integer number (1180958800).

Almost surely, 2^16661566051 is an apocalyptic number.

16661566051 is a deficient number, since it is larger than the sum of its proper divisors (2233774749).

16661566051 is a wasteful number, since it uses less digits than its factorization.

16661566051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27658.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 16661566051 in words is "sixteen billion, six hundred sixty-one million, five hundred sixty-six thousand, fifty-one".