12581500005 has 12 divisors (see below), whose sum is σ = 21807933420. Its totient is φ = 6710133312.

The previous prime is 12581500003. The next prime is 12581500037. The reversal of 12581500005 is 50000518521.

It can be written as a sum of positive squares in 2 ways, for example, as 4782137409 + 7799362596 = 69153^2 + 88314^2 .

It is not a de Polignac number, because 12581500005 - 2¹ = 12581500003 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12581500003) 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, 139794400 + ... + 139794489.

It is an arithmetic number, because the mean of its divisors is an integer number (1817327785).

Almost surely, 2^12581500005 is an apocalyptic number.

12581500005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12581500005 is a deficient number, since it is larger than the sum of its proper divisors (9226433415).

12581500005 is a wasteful number, since it uses less digits than its factorization.

12581500005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279588900 (or 279588897 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The spelling of 12581500005 in words is "twelve billion, five hundred eighty-one million, five hundred thousand, five".