168665571272 has 32 divisors (see below), whose sum is σ = 352338145920. Its totient is φ = 75034971840.

The previous prime is 168665571233. The next prime is 168665571287. The reversal of 168665571272 is 272175566861.

It is a super-2 number, since 2×168665571272² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20385803 + ... + 20394074.

It is an arithmetic number, because the mean of its divisors is an integer number (11010567060).

Almost surely, 2^168665571272 is an apocalyptic number.

It is an amenable number.

168665571272 is an abundant number, since it is smaller than the sum of its proper divisors (183672574648).

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

168665571272 is a wasteful number, since it uses less digits than its factorization.

168665571272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40779941 (or 40779937 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 56.

It can be divided in two parts, 168665 and 571272, that added together give a palindrome (739937).

The spelling of 168665571272 in words is "one hundred sixty-eight billion, six hundred sixty-five million, five hundred seventy-one thousand, two hundred seventy-two".