12261329544 has 32 divisors (see below), whose sum is σ = 31305525120. Its totient is φ = 4000149696.

The previous prime is 12261329519. The next prime is 12261329569. The reversal of 12261329544 is 44592316221.

It is an interprime number because it is at equal distance from previous prime (12261329519) and next prime (12261329569).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5433859 + ... + 5436114.

It is an arithmetic number, because the mean of its divisors is an integer number (978297660).

Almost surely, 2^12261329544 is an apocalyptic number.

It is an amenable number.

12261329544 is an abundant number, since it is smaller than the sum of its proper divisors (19044195576).

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

12261329544 is a wasteful number, since it uses less digits than its factorization.

12261329544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10870029 (or 10870025 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The spelling of 12261329544 in words is "twelve billion, two hundred sixty-one million, three hundred twenty-nine thousand, five hundred forty-four".