166443553 has 4 divisors (see below), whose sum is σ = 175203760. Its totient is φ = 157683348.

The previous prime is 166443551. The next prime is 166443569. The reversal of 166443553 is 355344661.

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.

It is a cyclic number.

It is not a de Polignac number, because 166443553 - 2¹ = 166443551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166443551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4380075 + ... + 4380112.

It is an arithmetic number, because the mean of its divisors is an integer number (43800940).

Almost surely, 2^166443553 is an apocalyptic number.

It is an amenable number.

166443553 is a deficient number, since it is larger than the sum of its proper divisors (8760207).

166443553 is an equidigital number, since it uses as much as digits as its factorization.

166443553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8760206.

The product of its digits is 129600, while the sum is 37.

The square root of 166443553 is about 12901.3004383279. The cubic root of 166443553 is about 550.0755301230.

The spelling of 166443553 in words is "one hundred sixty-six million, four hundred forty-three thousand, five hundred fifty-three".