168535538539 has 2 divisors, whose sum is σ = 168535538540. Its totient is φ = 168535538538.

The previous prime is 168535538471. The next prime is 168535538543. The reversal of 168535538539 is 935835535861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 168535538539 - 2⁹ = 168535538027 is a prime.

It is not a weakly prime, because it can be changed into another prime (168535538839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84267769269 + 84267769270.

It is an arithmetic number, because the mean of its divisors is an integer number (84267769270).

Almost surely, 2^168535538539 is an apocalyptic number.

168535538539 is a deficient number, since it is larger than the sum of its proper divisors (1).

168535538539 is an equidigital number, since it uses as much as digits as its factorization.

168535538539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320000, while the sum is 61.

The spelling of 168535538539 in words is "one hundred sixty-eight billion, five hundred thirty-five million, five hundred thirty-eight thousand, five hundred thirty-nine".