12505531000 has 64 divisors (see below), whose sum is σ = 29564851680. Its totient is φ = 4950604800.

The previous prime is 12505530967. The next prime is 12505531001. The reversal of 12505531000 is 13550521.

It is a super-2 number, since 2×12505531000² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12505531001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32539 + ... + 161461.

Almost surely, 2^12505531000 is an apocalyptic number.

12505531000 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 12505531000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14782425840).

12505531000 is an abundant number, since it is smaller than the sum of its proper divisors (17059320680).

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

12505531000 is a wasteful number, since it uses less digits than its factorization.

12505531000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129041 (or 129027 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The spelling of 12505531000 in words is "twelve billion, five hundred five million, five hundred thirty-one thousand".