166443444344661 has 12 divisors (see below), whose sum is σ = 243933642951936. Its totient is φ = 100874814754120.

The previous prime is 166443444344659. The next prime is 166443444344699.

166443444344661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 166443444344661 - 2¹ = 166443444344659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166443444344595 and 166443444344604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166443444346661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229260942261 + ... + 229260942986.

It is an arithmetic number, because the mean of its divisors is an integer number (20327803579328).

Almost surely, 2^{166443444344661} is an apocalyptic number.

166443444344661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166443444344661 is a deficient number, since it is larger than the sum of its proper divisors (77490198607275).

166443444344661 is a wasteful number, since it uses less digits than its factorization.

166443444344661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458521885272 (or 458521885261 counting only the distinct ones).

The product of its digits is 191102976, while the sum is 60.

The spelling of 166443444344661 in words is "one hundred sixty-six trillion, four hundred forty-three billion, four hundred forty-four million, three hundred forty-four thousand, six hundred sixty-one".