168140501897 has 2 divisors, whose sum is σ = 168140501898. Its totient is φ = 168140501896.

The previous prime is 168140501861. The next prime is 168140501909. The reversal of 168140501897 is 798105041861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148942736761 + 19197765136 = 385931^2 + 138556^2 .

It is a cyclic number.

It is not a de Polignac number, because 168140501897 - 2⁶ = 168140501833 is a prime.

It is not a weakly prime, because it can be changed into another prime (168140500897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84070250948 + 84070250949.

It is an arithmetic number, because the mean of its divisors is an integer number (84070250949).

Almost surely, 2^168140501897 is an apocalyptic number.

It is an amenable number.

168140501897 is a deficient number, since it is larger than the sum of its proper divisors (1).

168140501897 is an equidigital number, since it uses as much as digits as its factorization.

168140501897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 50.

The spelling of 168140501897 in words is "one hundred sixty-eight billion, one hundred forty million, five hundred one thousand, eight hundred ninety-seven".