80666181 has 12 divisors (see below), whose sum is σ = 117111852. Its totient is φ = 53503296.

The previous prime is 80666167. The next prime is 80666219. The reversal of 80666181 is 18166608.

It can be written as a sum of positive squares in 2 ways, for example, as 51408900 + 29257281 = 7170^2 + 5409^2 .

It is not a de Polignac number, because 80666181 - 2⁵ = 80666149 is a prime.

It is a super-2 number, since 2×80666181² = 13014065514249522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80666101) 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, 20976 + ... + 24521.

It is an arithmetic number, because the mean of its divisors is an integer number (9759321).

Almost surely, 2^80666181 is an apocalyptic number.

It is an amenable number.

80666181 is a deficient number, since it is larger than the sum of its proper divisors (36445671).

80666181 is a wasteful number, since it uses less digits than its factorization.

80666181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45700 (or 45697 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 80666181 is about 8981.4353529934. The cubic root of 80666181 is about 432.0796695914.

The spelling of 80666181 in words is "eighty million, six hundred sixty-six thousand, one hundred eighty-one".