172668663 has 12 divisors (see below), whose sum is σ = 252924048. Its totient is φ = 113490720.

The previous prime is 172668649. The next prime is 172668689. The reversal of 172668663 is 366866271.

It is not a de Polignac number, because 172668663 - 2⁹ = 172668151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172668623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134470 + ... + 135747.

It is an arithmetic number, because the mean of its divisors is an integer number (21077004).

Almost surely, 2^172668663 is an apocalyptic number.

172668663 is a deficient number, since it is larger than the sum of its proper divisors (80255385).

172668663 is a wasteful number, since it uses less digits than its factorization.

172668663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270294 (or 270291 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 172668663 is about 13140.3448584883. The cubic root of 172668663 is about 556.8495102966.

The spelling of 172668663 in words is "one hundred seventy-two million, six hundred sixty-eight thousand, six hundred sixty-three".