172161665516512 has 48 divisors (see below), whose sum is σ = 395269130037600. Its totient is φ = 73783570930944.

The previous prime is 172161665516497. The next prime is 172161665516681. The reversal of 172161665516512 is 215615566161271.

It is a super-2 number, since 2×172161665516512² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7842630493 + ... + 7842652444.

It is an arithmetic number, because the mean of its divisors is an integer number (8234773542450).

Almost surely, 2^{172161665516512} is an apocalyptic number.

It is an amenable number.

172161665516512 is an abundant number, since it is smaller than the sum of its proper divisors (223107464521088).

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

172161665516512 is an equidigital number, since it uses as much as digits as its factorization.

172161665516512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15685282968 (or 15685282946 counting only the distinct ones).

The product of its digits is 4536000, while the sum is 55.

The spelling of 172161665516512 in words is "one hundred seventy-two trillion, one hundred sixty-one billion, six hundred sixty-five million, five hundred sixteen thousand, five hundred twelve".