12409897697442 has 128 divisors (see below), whose sum is σ = 32927299891200. Its totient is φ = 3387421876608.

The previous prime is 12409897697411. The next prime is 12409897697447. The reversal of 12409897697442 is 24479679890421.

12409897697442 is a `hidden beast` number, since 1 + 2 + 4 + 0 + 9 + 8 + 97 + 6 + 97 + 442 = 666.

It is not an unprimeable number, because it can be changed into a prime (12409897697447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6326934 + ... + 8052942.

It is an arithmetic number, because the mean of its divisors is an integer number (257244530400).

Almost surely, 2^{12409897697442} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12409897697442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16463649945600).

12409897697442 is an abundant number, since it is smaller than the sum of its proper divisors (20517402193758).

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

12409897697442 is a wasteful number, since it uses less digits than its factorization.

12409897697442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726877 (or 1726871 counting only the distinct ones).

The product of its (nonzero) digits is 438939648, while the sum is 72.

The spelling of 12409897697442 in words is "twelve trillion, four hundred nine billion, eight hundred ninety-seven million, six hundred ninety-seven thousand, four hundred forty-two".