660472181 has 2 divisors, whose sum is σ = 660472182. Its totient is φ = 660472180.

The previous prime is 660472177. The next prime is 660472201. The reversal of 660472181 is 181274066.

660472181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 474586225 + 185885956 = 21785^2 + 13634^2 .

It is a cyclic number.

It is not a de Polignac number, because 660472181 - 2² = 660472177 is a prime.

It is a super-2 number, since 2×660472181² = 872447003749793522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660472121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330236090 + 330236091.

It is an arithmetic number, because the mean of its divisors is an integer number (330236091).

Almost surely, 2^660472181 is an apocalyptic number.

It is an amenable number.

660472181 is a deficient number, since it is larger than the sum of its proper divisors (1).

660472181 is an equidigital number, since it uses as much as digits as its factorization.

660472181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 660472181 is about 25699.6533245100. The cubic root of 660472181 is about 870.8663501921.

The spelling of 660472181 in words is "six hundred sixty million, four hundred seventy-two thousand, one hundred eighty-one".