168544696321 has 2 divisors, whose sum is σ = 168544696322. Its totient is φ = 168544696320.

The previous prime is 168544696273. The next prime is 168544696381. The reversal of 168544696321 is 123696445861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157470080625 + 11074615696 = 396825^2 + 105236^2 .

It is a cyclic number.

It is not a de Polignac number, because 168544696321 - 2¹³ = 168544688129 is a prime.

It is a super-2 number, since 2×168544696321² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (168544696381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84272348160 + 84272348161.

It is an arithmetic number, because the mean of its divisors is an integer number (84272348161).

Almost surely, 2^168544696321 is an apocalyptic number.

It is an amenable number.

168544696321 is a deficient number, since it is larger than the sum of its proper divisors (1).

168544696321 is an equidigital number, since it uses as much as digits as its factorization.

168544696321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7464960, while the sum is 55.

The spelling of 168544696321 in words is "one hundred sixty-eight billion, five hundred forty-four million, six hundred ninety-six thousand, three hundred twenty-one".