16661326417 has 16 divisors (see below), whose sum is σ = 17190169920. Its totient is φ = 16142287168.

The previous prime is 16661326411. The next prime is 16661326421. The reversal of 16661326417 is 71462316661.

16661326417 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16661326417 - 2¹⁹ = 16660802129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16661326411) 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, 1236963 + ... + 1250359.

It is an arithmetic number, because the mean of its divisors is an integer number (1074385620).

Almost surely, 2^16661326417 is an apocalyptic number.

It is an amenable number.

16661326417 is a deficient number, since it is larger than the sum of its proper divisors (528843503).

16661326417 is a wasteful number, since it uses less digits than its factorization.

16661326417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13760.

The product of its digits is 217728, while the sum is 43.

The spelling of 16661326417 in words is "sixteen billion, six hundred sixty-one million, three hundred twenty-six thousand, four hundred seventeen".