12543550001 has 4 divisors (see below), whose sum is σ = 12570998052. Its totient is φ = 12516101952.

The previous prime is 12543549959. The next prime is 12543550007. The reversal of 12543550001 is 10005534521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10005534521 = 73679 ⋅135799.

It can be written as a sum of positive squares in 2 ways, for example, as 5012781601 + 7530768400 = 70801^2 + 86780^2 .

It is a cyclic number.

It is not a de Polignac number, because 12543550001 - 2¹⁰ = 12543548977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12543550007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13723340 + ... + 13724253.

It is an arithmetic number, because the mean of its divisors is an integer number (3142749513).

Almost surely, 2^12543550001 is an apocalyptic number.

It is an amenable number.

12543550001 is a deficient number, since it is larger than the sum of its proper divisors (27448051).

12543550001 is an equidigital number, since it uses as much as digits as its factorization.

12543550001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27448050.

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 12543550001 in words is "twelve billion, five hundred forty-three million, five hundred fifty thousand, one".