12181311548 has 24 divisors (see below), whose sum is σ = 24366405504. Its totient is φ = 5219751600.

The previous prime is 12181311547. The next prime is 12181311557. The reversal of 12181311548 is 84511318121.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12181311547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171743 + ... + 232073.

It is an arithmetic number, because the mean of its divisors is an integer number (1015266896).

Almost surely, 2^12181311548 is an apocalyptic number.

It is an amenable number.

12181311548 is an abundant number, since it is smaller than the sum of its proper divisors (12185093956).

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

12181311548 is a wasteful number, since it uses less digits than its factorization.

12181311548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67553 (or 67551 counting only the distinct ones).

The product of its digits is 7680, while the sum is 35.

Adding to 12181311548 its reverse (84511318121), we get a palindrome (96692629669).

The spelling of 12181311548 in words is "twelve billion, one hundred eighty-one million, three hundred eleven thousand, five hundred forty-eight".