168270015821 has 2 divisors, whose sum is σ = 168270015822. Its totient is φ = 168270015820.

The previous prime is 168270015779. The next prime is 168270015871. The reversal of 168270015821 is 128510072861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110981593321 + 57288422500 = 333139^2 + 239350^2 .

It is a cyclic number.

It is not a de Polignac number, because 168270015821 - 2¹⁸ = 168269753677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168270015871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84135007910 + 84135007911.

It is an arithmetic number, because the mean of its divisors is an integer number (84135007911).

Almost surely, 2^168270015821 is an apocalyptic number.

It is an amenable number.

168270015821 is a deficient number, since it is larger than the sum of its proper divisors (1).

168270015821 is an equidigital number, since it uses as much as digits as its factorization.

168270015821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 41.

The spelling of 168270015821 in words is "one hundred sixty-eight billion, two hundred seventy million, fifteen thousand, eight hundred twenty-one".