168918161 has 2 divisors, whose sum is σ = 168918162. Its totient is φ = 168918160.

The previous prime is 168918143. The next prime is 168918179. The reversal of 168918161 is 161819861.

It is a balanced prime because it is at equal distance from previous prime (168918143) and next prime (168918179).

It can be written as a sum of positive squares in only one way, i.e., 145347136 + 23571025 = 12056^2 + 4855^2 .

It is a cyclic number.

It is not a de Polignac number, because 168918161 - 2⁶ = 168918097 is a prime.

It is not a weakly prime, because it can be changed into another prime (168918361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84459080 + 84459081.

It is an arithmetic number, because the mean of its divisors is an integer number (84459081).

Almost surely, 2^168918161 is an apocalyptic number.

It is an amenable number.

168918161 is a deficient number, since it is larger than the sum of its proper divisors (1).

168918161 is an equidigital number, since it uses as much as digits as its factorization.

168918161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 41.

The square root of 168918161 is about 12996.8519649952. The cubic root of 168918161 is about 552.7882225004.

It can be divided in two parts, 16891 and 8161, that added together give a palindrome (25052).

The spelling of 168918161 in words is "one hundred sixty-eight million, nine hundred eighteen thousand, one hundred sixty-one".