12354543656 has 96 divisors (see below), whose sum is σ = 30281610240. Its totient is φ = 4674966912.

The previous prime is 12354543629. The next prime is 12354543659. The reversal of 12354543656 is 65634545321.

It is not an unprimeable number, because it can be changed into a prime (12354543659) 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, 64505 + ... + 169911.

It is an arithmetic number, because the mean of its divisors is an integer number (315433440).

Almost surely, 2^12354543656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12354543656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15140805120).

12354543656 is an abundant number, since it is smaller than the sum of its proper divisors (17927066584).

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

12354543656 is a wasteful number, since it uses less digits than its factorization.

12354543656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105463 (or 105452 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 44.

The spelling of 12354543656 in words is "twelve billion, three hundred fifty-four million, five hundred forty-three thousand, six hundred fifty-six".