168350008921 has 2 divisors, whose sum is σ = 168350008922. Its totient is φ = 168350008920.

The previous prime is 168350008913. The next prime is 168350008933. The reversal of 168350008921 is 129800053861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129304248921 + 39045760000 = 359589^2 + 197600^2 .

It is a cyclic number.

It is not a de Polignac number, because 168350008921 - 2³ = 168350008913 is a prime.

It is not a weakly prime, because it can be changed into another prime (168350008121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84175004460 + 84175004461.

It is an arithmetic number, because the mean of its divisors is an integer number (84175004461).

Almost surely, 2^168350008921 is an apocalyptic number.

It is an amenable number.

168350008921 is a deficient number, since it is larger than the sum of its proper divisors (1).

168350008921 is an equidigital number, since it uses as much as digits as its factorization.

168350008921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 168350008921 in words is "one hundred sixty-eight billion, three hundred fifty million, eight thousand, nine hundred twenty-one".