168153686351891 has 2 divisors, whose sum is σ = 168153686351892. Its totient is φ = 168153686351890.

The previous prime is 168153686351857. The next prime is 168153686352019. The reversal of 168153686351891 is 198153686351861.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168153686351891 is a prime.

It is not a weakly prime, because it can be changed into another prime (168153686351491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84076843175945 + 84076843175946.

It is an arithmetic number, because the mean of its divisors is an integer number (84076843175946).

Almost surely, 2^{168153686351891} is an apocalyptic number.

168153686351891 is a deficient number, since it is larger than the sum of its proper divisors (1).

168153686351891 is an equidigital number, since it uses as much as digits as its factorization.

168153686351891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 223948800, while the sum is 71.

The spelling of 168153686351891 in words is "one hundred sixty-eight trillion, one hundred fifty-three billion, six hundred eighty-six million, three hundred fifty-one thousand, eight hundred ninety-one".