12891530560 has 28 divisors (see below), whose sum is σ = 30697957908. Its totient is φ = 5156612096.

The previous prime is 12891530551. The next prime is 12891530599. The reversal of 12891530560 is 6503519821.

It can be written as a sum of positive squares in 2 ways, for example, as 7080212736 + 5811317824 = 84144^2 + 76232^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20142697 + ... + 20143336.

Almost surely, 2^12891530560 is an apocalyptic number.

12891530560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12891530560 is an abundant number, since it is smaller than the sum of its proper divisors (17806427348).

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

12891530560 is an equidigital number, since it uses as much as digits as its factorization.

12891530560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40286050 (or 40286040 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 12891530560 in words is "twelve billion, eight hundred ninety-one million, five hundred thirty thousand, five hundred sixty".