12155665752 has 96 divisors (see below), whose sum is σ = 34699719600. Its totient is φ = 3838318848.

The previous prime is 12155665751. The next prime is 12155665763. The reversal of 12155665752 is 25756655121.

12155665752 is a `hidden beast` number, since 1 + 2 + 15 + 5 + 66 + 575 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 12155665698 and 12155665707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155665751) 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, 55743 + ... + 165585.

Almost surely, 2^12155665752 is an apocalyptic number.

12155665752 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 12155665752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17349859800).

12155665752 is an abundant number, since it is smaller than the sum of its proper divisors (22544053848).

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

12155665752 is a wasteful number, since it uses less digits than its factorization.

12155665752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109937 (or 109930 counting only the distinct ones).

The product of its digits is 630000, while the sum is 45.

The spelling of 12155665752 in words is "twelve billion, one hundred fifty-five million, six hundred sixty-five thousand, seven hundred fifty-two".