173338661 has 2 divisors, whose sum is σ = 173338662. Its totient is φ = 173338660.

The previous prime is 173338651. The next prime is 173338663. The reversal of 173338661 is 166833371.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142324900 + 31013761 = 11930^2 + 5569^2 .

It is an emirp because it is prime and its reverse (166833371) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 173338661 - 2²² = 169144357 is a prime.

Together with 173338663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173338663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86669330 + 86669331.

It is an arithmetic number, because the mean of its divisors is an integer number (86669331).

Almost surely, 2^173338661 is an apocalyptic number.

It is an amenable number.

173338661 is a deficient number, since it is larger than the sum of its proper divisors (1).

173338661 is an equidigital number, since it uses as much as digits as its factorization.

173338661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 38.

The square root of 173338661 is about 13165.8141031992. The cubic root of 173338661 is about 557.5688196194.

The spelling of 173338661 in words is "one hundred seventy-three million, three hundred thirty-eight thousand, six hundred sixty-one".