172089284718825 has 36 divisors (see below), whose sum is σ = 324453715758640. Its totient is φ = 86950375434720.

The previous prime is 172089284718823. The next prime is 172089284718877. The reversal of 172089284718825 is 528817482980271.

It is a happy number.

172089284718825 is a `hidden beast` number, since 1 + 72 + 0 + 8 + 9 + 2 + 8 + 471 + 8 + 82 + 5 = 666.

172089284718825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 172089284718825 - 2¹ = 172089284718823 is a prime.

It is a super-2 number, since 2×172089284718825² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172089284718823) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20127397447 + ... + 20127405996.

Almost surely, 2^{172089284718825} is an apocalyptic number.

172089284718825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172089284718825 is a deficient number, since it is larger than the sum of its proper divisors (152364431039815).

172089284718825 is a wasteful number, since it uses less digits than its factorization.

172089284718825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40254803478 (or 40254803470 counting only the distinct ones).

The product of its (nonzero) digits is 289013760, while the sum is 72.

The spelling of 172089284718825 in words is "one hundred seventy-two trillion, eighty-nine billion, two hundred eighty-four million, seven hundred eighteen thousand, eight hundred twenty-five".