173164154421721 has 2 divisors, whose sum is σ = 173164154421722. Its totient is φ = 173164154421720.

The previous prime is 173164154421707. The next prime is 173164154421737. The reversal of 173164154421721 is 127124451461371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171692251653321 + 1471902768400 = 13103139^2 + 1213220^2 .

It is a cyclic number.

It is not a de Polignac number, because 173164154421721 - 2⁷ = 173164154421593 is a prime.

It is not a weakly prime, because it can be changed into another prime (173164154421701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86582077210860 + 86582077210861.

It is an arithmetic number, because the mean of its divisors is an integer number (86582077210861).

Almost surely, 2^{173164154421721} is an apocalyptic number.

It is an amenable number.

173164154421721 is a deficient number, since it is larger than the sum of its proper divisors (1).

173164154421721 is an equidigital number, since it uses as much as digits as its factorization.

173164154421721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 49.

The spelling of 173164154421721 in words is "one hundred seventy-three trillion, one hundred sixty-four billion, one hundred fifty-four million, four hundred twenty-one thousand, seven hundred twenty-one".