12731222616 has 128 divisors (see below), whose sum is σ = 39090055680. Its totient is φ = 3372374016.

The previous prime is 12731222611. The next prime is 12731222629. The reversal of 12731222616 is 61622213721.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12731222611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158086 + ... + 224618.

It is an arithmetic number, because the mean of its divisors is an integer number (305391060).

Almost surely, 2^12731222616 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 12731222616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19545027840).

12731222616 is an abundant number, since it is smaller than the sum of its proper divisors (26358833064).

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

12731222616 is a wasteful number, since it uses less digits than its factorization.

12731222616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66633 (or 66629 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The spelling of 12731222616 in words is "twelve billion, seven hundred thirty-one million, two hundred twenty-two thousand, six hundred sixteen".