173390919893 has 2 divisors, whose sum is σ = 173390919894. Its totient is φ = 173390919892.

The previous prime is 173390919857. The next prime is 173390919899. The reversal of 173390919893 is 398919093371.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107568912529 + 65822007364 = 327977^2 + 256558^2 .

It is a cyclic number.

It is not a de Polignac number, because 173390919893 - 2³⁰ = 172317178069 is a prime.

It is a super-2 number, since 2×173390919893² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173390919899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86695459946 + 86695459947.

It is an arithmetic number, because the mean of its divisors is an integer number (86695459947).

Almost surely, 2^173390919893 is an apocalyptic number.

It is an amenable number.

173390919893 is a deficient number, since it is larger than the sum of its proper divisors (1).

173390919893 is an equidigital number, since it uses as much as digits as its factorization.

173390919893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9920232, while the sum is 62.

The spelling of 173390919893 in words is "one hundred seventy-three billion, three hundred ninety million, nine hundred nineteen thousand, eight hundred ninety-three".