12656433240 has 192 divisors, whose sum is σ = 46320768000. Its totient is φ = 2969222400.

The previous prime is 12656433239. The next prime is 12656433247. The reversal of 12656433240 is 4233465621.

12656433240 is a `hidden beast` number, since 1 + 2 + 6 + 5 + 643 + 3 + 2 + 4 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 12656433195 and 12656433204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12656433247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 71211 + ... + 174309.

It is an arithmetic number, because the mean of its divisors is an integer number (241254000).

Almost surely, 2^12656433240 is an apocalyptic number.

12656433240 is a gapful number since it is divisible by the number (10) 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 12656433240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23160384000).

12656433240 is an abundant number, since it is smaller than the sum of its proper divisors (33664334760).

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

12656433240 is a wasteful number, since it uses less digits than its factorization.

12656433240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103158 (or 103151 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 12656433240 its reverse (4233465621), we get a palindrome (16889898861).

The spelling of 12656433240 in words is "twelve billion, six hundred fifty-six million, four hundred thirty-three thousand, two hundred forty".