168047157728251 has 2 divisors, whose sum is σ = 168047157728252. Its totient is φ = 168047157728250.

The previous prime is 168047157728239. The next prime is 168047157728267. The reversal of 168047157728251 is 152827751740861.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168047157728251 is a prime.

It is not a weakly prime, because it can be changed into another prime (168047157728651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84023578864125 + 84023578864126.

It is an arithmetic number, because the mean of its divisors is an integer number (84023578864126).

Almost surely, 2^{168047157728251} is an apocalyptic number.

168047157728251 is a deficient number, since it is larger than the sum of its proper divisors (1).

168047157728251 is an equidigital number, since it uses as much as digits as its factorization.

168047157728251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52684800, while the sum is 64.

The spelling of 168047157728251 in words is "one hundred sixty-eight trillion, forty-seven billion, one hundred fifty-seven million, seven hundred twenty-eight thousand, two hundred fifty-one".