12491656704 has 400 divisors, whose sum is σ = 39927444480. Its totient is φ = 3876802560.

The previous prime is 12491656703. The next prime is 12491656711. The reversal of 12491656704 is 40765619421.

It is a self number, because there is not a number n which added to its sum of digits gives 12491656704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12491656703) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 65401249 + ... + 65401439.

Almost surely, 2^12491656704 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 12491656704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19963722240).

12491656704 is an abundant number, since it is smaller than the sum of its proper divisors (27435787776).

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

12491656704 is an equidigital number, since it uses as much as digits as its factorization.

12491656704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 12491656704 in words is "twelve billion, four hundred ninety-one million, six hundred fifty-six thousand, seven hundred four".