168859748355509 has 2 divisors, whose sum is σ = 168859748355510. Its totient is φ = 168859748355508.

The previous prime is 168859748355443. The next prime is 168859748355553. The reversal of 168859748355509 is 905553847958861.

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., 143756862718225 + 25102885637284 = 11989865^2 + 5010278^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168859748355509 is a prime.

It is a super-2 number, since 2×168859748355509² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168859748355559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84429874177754 + 84429874177755.

It is an arithmetic number, because the mean of its divisors is an integer number (84429874177755).

Almost surely, 2^{168859748355509} is an apocalyptic number.

It is an amenable number.

168859748355509 is a deficient number, since it is larger than the sum of its proper divisors (1).

168859748355509 is an equidigital number, since it uses as much as digits as its factorization.

168859748355509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13063680000, while the sum is 83.

The spelling of 168859748355509 in words is "one hundred sixty-eight trillion, eight hundred fifty-nine billion, seven hundred forty-eight million, three hundred fifty-five thousand, five hundred nine".