173421925609 has 4 divisors (see below), whose sum is σ = 174585831300. Its totient is φ = 172258019920.

The previous prime is 173421925603. The next prime is 173421925619. The reversal of 173421925609 is 906529124371.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12518253225 + 160903672384 = 111885^2 + 401128^2 .

It is a cyclic number.

It is not a de Polignac number, because 173421925609 - 2³ = 173421925601 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (173421925601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581952622 + ... + 581952919.

It is an arithmetic number, because the mean of its divisors is an integer number (43646457825).

Almost surely, 2^173421925609 is an apocalyptic number.

It is an amenable number.

173421925609 is a deficient number, since it is larger than the sum of its proper divisors (1163905691).

173421925609 is a wasteful number, since it uses less digits than its factorization.

173421925609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163905690.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 173421925609 in words is "one hundred seventy-three billion, four hundred twenty-one million, nine hundred twenty-five thousand, six hundred nine".