12523108721664 has 88 divisors (see below), whose sum is σ = 33413683088160. Its totient is φ = 4169988358144.

The previous prime is 12523108721663. The next prime is 12523108721719. The reversal of 12523108721664 is 46612780132521.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (12523108721663) 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, 788827 + ... + 5066405.

Almost surely, 2^{12523108721664} 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 12523108721664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16706841544080).

12523108721664 is an abundant number, since it is smaller than the sum of its proper divisors (20890574366496).

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

12523108721664 is an equidigital number, since it uses as much as digits as its factorization.

12523108721664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278555 (or 4278537 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 12523108721664 in words is "twelve trillion, five hundred twenty-three billion, one hundred eight million, seven hundred twenty-one thousand, six hundred sixty-four".