16661303447601 has 16 divisors (see below), whose sum is σ = 22224378363264. Its totient is φ = 11102882972544.

The previous prime is 16661303447567. The next prime is 16661303447671. The reversal of 16661303447601 is 10674430316661.

It is not a de Polignac number, because 16661303447601 - 2¹⁰ = 16661303446577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16661303447671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78553045 + ... + 78764861.

It is an arithmetic number, because the mean of its divisors is an integer number (1389023647704).

Almost surely, 2^{16661303447601} is an apocalyptic number.

It is an amenable number.

16661303447601 is a deficient number, since it is larger than the sum of its proper divisors (5563074915663).

16661303447601 is a wasteful number, since it uses less digits than its factorization.

16661303447601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222680.

The product of its (nonzero) digits is 1306368, while the sum is 48.

The spelling of 16661303447601 in words is "sixteen trillion, six hundred sixty-one billion, three hundred three million, four hundred forty-seven thousand, six hundred one".