172268992809 has 45 divisors (see below), whose sum is σ = 260371732621. Its totient is φ = 113508694440.

The previous prime is 172268992787. The next prime is 172268992811. The reversal of 172268992809 is 908299862271.

It is a happy number.

The square root of 172268992809 is 415053.

It is a perfect power (a square), and thus also a powerful number.

172268992809 is a `hidden beast` number, since 1 + 7 + 2 + 268 + 99 + 280 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-172268992809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172268992849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 399695824 + ... + 399696254.

Almost surely, 2^172268992809 is an apocalyptic number.

172268992809 is the 415053-rd square number.

172268992809 is the 207527-th centered octagonal number.

It is an amenable number.

172268992809 is a deficient number, since it is larger than the sum of its proper divisors (88102739812).

172268992809 is an frugal number, since it uses more digits than its factorization.

172268992809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088 (or 541 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 63.

The spelling of 172268992809 in words is "one hundred seventy-two billion, two hundred sixty-eight million, nine hundred ninety-two thousand, eight hundred nine".