168811687601 has 2 divisors, whose sum is σ = 168811687602. Its totient is φ = 168811687600.

The previous prime is 168811687529. The next prime is 168811687631. The reversal of 168811687601 is 106786118861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148206520576 + 20605167025 = 384976^2 + 143545^2 .

It is a cyclic number.

It is not a de Polignac number, because 168811687601 - 2¹⁸ = 168811425457 is a prime.

It is not a weakly prime, because it can be changed into another prime (168811687631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84405843800 + 84405843801.

It is an arithmetic number, because the mean of its divisors is an integer number (84405843801).

Almost surely, 2^168811687601 is an apocalyptic number.

It is an amenable number.

168811687601 is a deficient number, since it is larger than the sum of its proper divisors (1).

168811687601 is an equidigital number, since it uses as much as digits as its factorization.

168811687601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 774144, while the sum is 53.

The spelling of 168811687601 in words is "one hundred sixty-eight billion, eight hundred eleven million, six hundred eighty-seven thousand, six hundred one".