166551841 has 8 divisors (see below), whose sum is σ = 168681960. Its totient is φ = 164427648.

The previous prime is 166551823. The next prime is 166551863. The reversal of 166551841 is 148155661.

It can be written as a sum of positive squares in 4 ways, for example, as 37161216 + 129390625 = 6096^2 + 11375^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166551841 - 2⁷ = 166551713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166551841.

It is not an unprimeable number, because it can be changed into a prime (166557841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87795 + ... + 89671.

It is an arithmetic number, because the mean of its divisors is an integer number (21085245).

Almost surely, 2^166551841 is an apocalyptic number.

It is an amenable number.

166551841 is a deficient number, since it is larger than the sum of its proper divisors (2130119).

166551841 is an equidigital number, since it uses as much as digits as its factorization.

166551841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2963.

The product of its digits is 28800, while the sum is 37.

The square root of 166551841 is about 12905.4965421715. The cubic root of 166551841 is about 550.1947971150.

It can be divided in two parts, 16655 and 1841, that added together give a square (18496 = 136²).

The spelling of 166551841 in words is "one hundred sixty-six million, five hundred fifty-one thousand, eight hundred forty-one".