168921238431097 has 2 divisors, whose sum is σ = 168921238431098. Its totient is φ = 168921238431096.

The previous prime is 168921238431073. The next prime is 168921238431139. The reversal of 168921238431097 is 790134832129861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157074810636601 + 11846427794496 = 12532949^2 + 3441864^2 .

It is a cyclic number.

It is not a de Polignac number, because 168921238431097 - 2⁷ = 168921238430969 is a prime.

It is not a weakly prime, because it can be changed into another prime (168921238431007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84460619215548 + 84460619215549.

It is an arithmetic number, because the mean of its divisors is an integer number (84460619215549).

Almost surely, 2^{168921238431097} is an apocalyptic number.

It is an amenable number.

168921238431097 is a deficient number, since it is larger than the sum of its proper divisors (1).

168921238431097 is an equidigital number, since it uses as much as digits as its factorization.

168921238431097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31352832, while the sum is 64.

The spelling of 168921238431097 in words is "one hundred sixty-eight trillion, nine hundred twenty-one billion, two hundred thirty-eight million, four hundred thirty-one thousand, ninety-seven".