12372171672 has 128 divisors (see below), whose sum is σ = 36952473600. Its totient is φ = 3377462400.

The previous prime is 12372171671. The next prime is 12372171673. The reversal of 12372171672 is 27617127321.

It is an interprime number because it is at equal distance from previous prime (12372171671) and next prime (12372171673).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 12372171672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12372171671) 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, 396397 + ... + 426467.

It is an arithmetic number, because the mean of its divisors is an integer number (288691200).

Almost surely, 2^12372171672 is an apocalyptic number.

12372171672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12372171672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18476236800).

12372171672 is an abundant number, since it is smaller than the sum of its proper divisors (24580301928).

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

12372171672 is a wasteful number, since it uses less digits than its factorization.

12372171672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30197 (or 30193 counting only the distinct ones).

The product of its digits is 49392, while the sum is 39.

Adding to 12372171672 its reverse (27617127321), we get a palindrome (39989298993).

The spelling of 12372171672 in words is "twelve billion, three hundred seventy-two million, one hundred seventy-one thousand, six hundred seventy-two".