16664331677 has 4 divisors (see below), whose sum is σ = 19044950496. Its totient is φ = 14283712860.

The previous prime is 16664331667. The next prime is 16664331679. The reversal of 16664331677 is 77613346661.

16664331677 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, and also an emirpimes, since its reverse is a distinct semiprime: 77613346661 = 12379 ⋅6269759.

It is a cyclic number.

It is not a de Polignac number, because 16664331677 - 2⁴ = 16664331661 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 (16664331679) 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, 1190309399 + ... + 1190309412.

It is an arithmetic number, because the mean of its divisors is an integer number (4761237624).

Almost surely, 2^16664331677 is an apocalyptic number.

It is an amenable number.

16664331677 is a deficient number, since it is larger than the sum of its proper divisors (2380618819).

16664331677 is an equidigital number, since it uses as much as digits as its factorization.

16664331677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380618818.

The product of its digits is 2286144, while the sum is 50.

The spelling of 16664331677 in words is "sixteen billion, six hundred sixty-four million, three hundred thirty-one thousand, six hundred seventy-seven".