12172520448 has 264 divisors, whose sum is σ = 38626398720. Its totient is φ = 3661455360.

The previous prime is 12172520447. The next prime is 12172520471. The reversal of 12172520448 is 84402527121.

12172520448 is a `hidden beast` number, since 1 + 21 + 72 + 520 + 4 + 48 = 666.

It is a tau number, because it is divible by the number of its divisors (264).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (12172520447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16929433 + ... + 16930151.

Almost surely, 2^12172520448 is an apocalyptic number.

12172520448 is a gapful number since it is divisible by the number (18) 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 12172520448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19313199360).

12172520448 is an abundant number, since it is smaller than the sum of its proper divisors (26453878272).

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

12172520448 is a wasteful number, since it uses less digits than its factorization.

12172520448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923 (or 902 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The spelling of 12172520448 in words is "twelve billion, one hundred seventy-two million, five hundred twenty thousand, four hundred forty-eight".