12491376520 has 96 divisors (see below), whose sum is σ = 32924462400. Its totient is φ = 4178142720.

The previous prime is 12491376517. The next prime is 12491376523. The reversal of 12491376520 is 2567319421.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12491376517) and next prime (12491376523).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (12491376523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 457411 + ... + 483949.

It is an arithmetic number, because the mean of its divisors is an integer number (342963150).

Almost surely, 2^12491376520 is an apocalyptic number.

12491376520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12491376520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16462231200).

12491376520 is an abundant number, since it is smaller than the sum of its proper divisors (20433085880).

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

12491376520 is a wasteful number, since it uses less digits than its factorization.

12491376520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26639 (or 26594 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 12491376520 in words is "twelve billion, four hundred ninety-one million, three hundred seventy-six thousand, five hundred twenty".