166181844 has 24 divisors (see below), whose sum is σ = 388009440. Its totient is φ = 55357984.

The previous prime is 166181843. The next prime is 166181849. The reversal of 166181844 is 448181661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166181843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20167 + ... + 27185.

It is an arithmetic number, because the mean of its divisors is an integer number (16167060).

Almost surely, 2^166181844 is an apocalyptic number.

It is an amenable number.

166181844 is an abundant number, since it is smaller than the sum of its proper divisors (221827596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166181844 is a wasteful number, since it uses less digits than its factorization.

166181844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8999 (or 8997 counting only the distinct ones).

The product of its digits is 36864, while the sum is 39.

The square root of 166181844 is about 12891.1537109756. The cubic root of 166181844 is about 549.7870735013.

The spelling of 166181844 in words is "one hundred sixty-six million, one hundred eighty-one thousand, eight hundred forty-four".