11601215172 has 48 divisors (see below), whose sum is σ = 30890133120. Its totient is φ = 3762554976.

The previous prime is 11601215167. The next prime is 11601215179. The reversal of 11601215172 is 27151210611.

11601215172 is a `hidden beast` number, since 1 + 1 + 601 + 2 + 1 + 51 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (11601215179) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1447608 + ... + 1455599.

It is an arithmetic number, because the mean of its divisors is an integer number (643544440).

Almost surely, 2^11601215172 is an apocalyptic number.

11601215172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11601215172 is an abundant number, since it is smaller than the sum of its proper divisors (19288917948).

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

11601215172 is a wasteful number, since it uses less digits than its factorization.

11601215172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903257 (or 2903249 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 27.

Adding to 11601215172 its reverse (27151210611), we get a palindrome (38752425783).

The spelling of 11601215172 in words is "eleven billion, six hundred one million, two hundred fifteen thousand, one hundred seventy-two".