168456533309 has 2 divisors, whose sum is σ = 168456533310. Its totient is φ = 168456533308.

The previous prime is 168456533291. The next prime is 168456533341. The reversal of 168456533309 is 903335654861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149056222084 + 19400311225 = 386078^2 + 139285^2 .

It is a cyclic number.

It is not a de Polignac number, because 168456533309 - 2²⁰ = 168455484733 is a prime.

It is a super-2 number, since 2×168456533309² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168456533009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84228266654 + 84228266655.

It is an arithmetic number, because the mean of its divisors is an integer number (84228266655).

Almost surely, 2^168456533309 is an apocalyptic number.

It is an amenable number.

168456533309 is a deficient number, since it is larger than the sum of its proper divisors (1).

168456533309 is an equidigital number, since it uses as much as digits as its factorization.

168456533309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6998400, while the sum is 53.

The spelling of 168456533309 in words is "one hundred sixty-eight billion, four hundred fifty-six million, five hundred thirty-three thousand, three hundred nine".