12566657652 has 96 divisors (see below), whose sum is σ = 31939100928. Its totient is φ = 3829561344.

The previous prime is 12566657611. The next prime is 12566657659. The reversal of 12566657652 is 25675666521.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 12566657595 and 12566657604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12566657659) 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, 6694138 + ... + 6696014.

It is an arithmetic number, because the mean of its divisors is an integer number (332698968).

Almost surely, 2^12566657652 is an apocalyptic number.

12566657652 is a gapful number since it is divisible by the number (12) 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 12566657652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15969550464).

12566657652 is an abundant number, since it is smaller than the sum of its proper divisors (19372443276).

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

12566657652 is a wasteful number, since it uses less digits than its factorization.

12566657652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2825 (or 2823 counting only the distinct ones).

The product of its digits is 4536000, while the sum is 51.

The spelling of 12566657652 in words is "twelve billion, five hundred sixty-six million, six hundred fifty-seven thousand, six hundred fifty-two".