40660181 has 2 divisors, whose sum is σ = 40660182. Its totient is φ = 40660180.

The previous prime is 40660129. The next prime is 40660183. The reversal of 40660181 is 18106604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38019556 + 2640625 = 6166^2 + 1625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40660181 is a prime.

It is a super-2 number, since 2×40660181² = 3306500637905522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 40660183, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is equal to p_2471327 and since 40660181 and 2471327 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40660181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40660183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20330090 + 20330091.

It is an arithmetic number, because the mean of its divisors is an integer number (20330091).

Almost surely, 2^40660181 is an apocalyptic number.

It is an amenable number.

40660181 is a deficient number, since it is larger than the sum of its proper divisors (1).

40660181 is an equidigital number, since it uses as much as digits as its factorization.

40660181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 40660181 is about 6376.5336194519. The cubic root of 40660181 is about 343.8664215685.

Adding to 40660181 its reverse (18106604), we get a palindrome (58766785).

The spelling of 40660181 in words is "forty million, six hundred sixty thousand, one hundred eighty-one".