12541567720 has 48 divisors (see below), whose sum is σ = 31017070980. Its totient is φ = 4560568320.

The previous prime is 12541567663. The next prime is 12541567721. The reversal of 12541567720 is 2776514521.

It can be written as a sum of positive squares in 2 ways, for example, as 12231032836 + 310534884 = 110594^2 + 17622^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

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 (12541567721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1290777 + ... + 1300456.

Almost surely, 2^12541567720 is an apocalyptic number.

12541567720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12541567720 is an abundant number, since it is smaller than the sum of its proper divisors (18475503260).

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

12541567720 is a wasteful number, since it uses less digits than its factorization.

12541567720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591266 (or 2591251 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 12541567720 in words is "twelve billion, five hundred forty-one million, five hundred sixty-seven thousand, seven hundred twenty".