12261854616 has 128 divisors (see below), whose sum is σ = 33728348160. Its totient is φ = 3684009600.

The previous prime is 12261854551. The next prime is 12261854623. The reversal of 12261854616 is 61645816221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26256415 + ... + 26256881.

It is an arithmetic number, because the mean of its divisors is an integer number (263502720).

Almost surely, 2^12261854616 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 12261854616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16864174080).

12261854616 is an abundant number, since it is smaller than the sum of its proper divisors (21466493544).

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

12261854616 is a wasteful number, since it uses less digits than its factorization.

12261854616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125 (or 1121 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The spelling of 12261854616 in words is "twelve billion, two hundred sixty-one million, eight hundred fifty-four thousand, six hundred sixteen".