162666181 has 2 divisors, whose sum is σ = 162666182. Its totient is φ = 162666180.

The previous prime is 162666173. The next prime is 162666197. The reversal of 162666181 is 181666261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158004900 + 4661281 = 12570^2 + 2159^2 .

It is a cyclic number.

It is not a de Polignac number, because 162666181 - 2³ = 162666173 is a prime.

It is a super-2 number, since 2×162666181² = 52920572882249522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 162666181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (162666781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81333090 + 81333091.

It is an arithmetic number, because the mean of its divisors is an integer number (81333091).

Almost surely, 2^162666181 is an apocalyptic number.

It is an amenable number.

162666181 is a deficient number, since it is larger than the sum of its proper divisors (1).

162666181 is an equidigital number, since it uses as much as digits as its factorization.

162666181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 162666181 is about 12754.0652734726. The cubic root of 162666181 is about 545.8823973973.

The spelling of 162666181 in words is "one hundred sixty-two million, six hundred sixty-six thousand, one hundred eighty-one".