162166561 has 2 divisors, whose sum is σ = 162166562. Its totient is φ = 162166560.

The previous prime is 162166559. The next prime is 162166573. The reversal of 162166561 is 165661261.

It is a happy number.

162166561 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., 159542161 + 2624400 = 12631^2 + 1620^2 .

It is a cyclic number.

It is not a de Polignac number, because 162166561 - 2¹ = 162166559 is a prime.

Together with 162166559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (162166531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81083280 + 81083281.

It is an arithmetic number, because the mean of its divisors is an integer number (81083281).

Almost surely, 2^162166561 is an apocalyptic number.

It is an amenable number.

162166561 is a deficient number, since it is larger than the sum of its proper divisors (1).

162166561 is an equidigital number, since it uses as much as digits as its factorization.

162166561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 34.

The square root of 162166561 is about 12734.4635144163. The cubic root of 162166561 is about 545.3229418958.

The spelling of 162166561 in words is "one hundred sixty-two million, one hundred sixty-six thousand, five hundred sixty-one".