162665281 has 2 divisors, whose sum is σ = 162665282. Its totient is φ = 162665280.

The previous prime is 162665227. The next prime is 162665291. The reversal of 162665281 is 182566261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91853056 + 70812225 = 9584^2 + 8415^2 .

It is a cyclic number.

It is not a de Polignac number, because 162665281 - 2¹⁵ = 162632513 is a prime.

It is a super-2 number, since 2×162665281² = 52919987285617922, 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 162665281.

It is not a weakly prime, because it can be changed into another prime (162665201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81332640 + 81332641.

It is an arithmetic number, because the mean of its divisors is an integer number (81332641).

Almost surely, 2^162665281 is an apocalyptic number.

It is an amenable number.

162665281 is a deficient number, since it is larger than the sum of its proper divisors (1).

162665281 is an equidigital number, since it uses as much as digits as its factorization.

162665281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 162665281 is about 12754.0299905559. The cubic root of 162665281 is about 545.8813906421.

The spelling of 162665281 in words is "one hundred sixty-two million, six hundred sixty-five thousand, two hundred eighty-one".