172326661 has 8 divisors (see below), whose sum is σ = 186610424. Its totient is φ = 158189760.

The previous prime is 172326659. The next prime is 172326673. The reversal of 172326661 is 166623271.

It is a happy number.

172326661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3976036 + 168350625 = 1994^2 + 12975^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172326661 - 2¹ = 172326659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172326631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34266 + ... + 38971.

It is an arithmetic number, because the mean of its divisors is an integer number (23326303).

Almost surely, 2^172326661 is an apocalyptic number.

It is an amenable number.

172326661 is a deficient number, since it is larger than the sum of its proper divisors (14283763).

172326661 is a wasteful number, since it uses less digits than its factorization.

172326661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73431.

The product of its digits is 18144, while the sum is 34.

The square root of 172326661 is about 13127.3249750282. The cubic root of 172326661 is about 556.4816197219.

The spelling of 172326661 in words is "one hundred seventy-two million, three hundred twenty-six thousand, six hundred sixty-one".