168675565081 has 2 divisors, whose sum is σ = 168675565082. Its totient is φ = 168675565080.

The previous prime is 168675565063. The next prime is 168675565127. The reversal of 168675565081 is 180565576861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141331635481 + 27343929600 = 375941^2 + 165360^2 .

It is a cyclic number.

It is not a de Polignac number, because 168675565081 - 2²¹ = 168673467929 is a prime.

It is a super-4 number, since 4×168675565081⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (168675565181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84337782540 + 84337782541.

It is an arithmetic number, because the mean of its divisors is an integer number (84337782541).

Almost surely, 2^168675565081 is an apocalyptic number.

It is an amenable number.

168675565081 is a deficient number, since it is larger than the sum of its proper divisors (1).

168675565081 is an equidigital number, since it uses as much as digits as its factorization.

168675565081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096000, while the sum is 58.

The spelling of 168675565081 in words is "one hundred sixty-eight billion, six hundred seventy-five million, five hundred sixty-five thousand, eighty-one".