173640890071321 has 2 divisors, whose sum is σ = 173640890071322. Its totient is φ = 173640890071320.

The previous prime is 173640890071237. The next prime is 173640890071351. The reversal of 173640890071321 is 123170098046371.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157050021441600 + 16590868629721 = 12531960^2 + 4073189^2 .

It is a cyclic number.

It is not a de Polignac number, because 173640890071321 - 2¹³ = 173640890063129 is a prime.

It is not a weakly prime, because it can be changed into another prime (173640890071351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86820445035660 + 86820445035661.

It is an arithmetic number, because the mean of its divisors is an integer number (86820445035661).

Almost surely, 2^{173640890071321} is an apocalyptic number.

It is an amenable number.

173640890071321 is a deficient number, since it is larger than the sum of its proper divisors (1).

173640890071321 is an equidigital number, since it uses as much as digits as its factorization.

173640890071321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 173640890071321 in words is "one hundred seventy-three trillion, six hundred forty billion, eight hundred ninety million, seventy-one thousand, three hundred twenty-one".