172517771868 has 48 divisors (see below), whose sum is σ = 437483360160. Its totient is φ = 52595391744.

The previous prime is 172517771861. The next prime is 172517771903. The reversal of 172517771868 is 868177715271.

It is a happy number.

It is a super-2 number, since 2×172517771868² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172517771861) 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 15 ways as a sum of consecutive naturals, for example, 5055855 + ... + 5089862.

It is an arithmetic number, because the mean of its divisors is an integer number (9114236670).

Almost surely, 2^172517771868 is an apocalyptic number.

It is an amenable number.

172517771868 is an abundant number, since it is smaller than the sum of its proper divisors (264965588292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172517771868 is a wasteful number, since it uses less digits than its factorization.

172517771868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10145846 (or 10145844 counting only the distinct ones).

The product of its digits is 9219840, while the sum is 60.

The spelling of 172517771868 in words is "one hundred seventy-two billion, five hundred seventeen million, seven hundred seventy-one thousand, eight hundred sixty-eight".