172113666508 has 96 divisors (see below), whose sum is σ = 373276366848. Its totient is φ = 67767168000.

The previous prime is 172113666503. The next prime is 172113666521. The reversal of 172113666508 is 805666311271.

It is a happy number.

It is a super-2 number, since 2×172113666508² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172113666503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3388185 + ... + 3438607.

It is an arithmetic number, because the mean of its divisors is an integer number (3888295488).

Almost surely, 2^172113666508 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172113666508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186638183424).

172113666508 is an abundant number, since it is smaller than the sum of its proper divisors (201162700340).

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

172113666508 is a wasteful number, since it uses less digits than its factorization.

172113666508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50623 (or 50621 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

Adding to 172113666508 its reverse (805666311271), we get a palindrome (977779977779).

The spelling of 172113666508 in words is "one hundred seventy-two billion, one hundred thirteen million, six hundred sixty-six thousand, five hundred eight".