181079966 has 24 divisors (see below), whose sum is σ = 290310480. Its totient is φ = 84549696.

The previous prime is 181079957. The next prime is 181080001. The reversal of 181079966 is 669970181.

It is a super-2 number, since 2×181079966² = 65579908173122312, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 181079966 parts by 19030 straight cuts.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 181079966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83990 + ... + 86118.

It is an arithmetic number, because the mean of its divisors is an integer number (12096270).

Almost surely, 2^181079966 is an apocalyptic number.

181079966 is a deficient number, since it is larger than the sum of its proper divisors (109230514).

181079966 is a wasteful number, since it uses less digits than its factorization.

181079966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240 (or 2197 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 181079966 is about 13456.5956318825. The cubic root of 181079966 is about 565.7485741664.

The spelling of 181079966 in words is "one hundred eighty-one million, seventy-nine thousand, nine hundred sixty-six".