12861493145 has 4 divisors (see below), whose sum is σ = 15433791780. Its totient is φ = 10289194512.

The previous prime is 12861493109. The next prime is 12861493153. The reversal of 12861493145 is 54139416821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8517628681 + 4343864464 = 92291^2 + 65908^2 .

It is a cyclic number.

It is not a de Polignac number, because 12861493145 - 2⁶ = 12861493081 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12861493096 and 12861493105.

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, 1286149310 + ... + 1286149319.

It is an arithmetic number, because the mean of its divisors is an integer number (3858447945).

Almost surely, 2^12861493145 is an apocalyptic number.

It is an amenable number.

12861493145 is a deficient number, since it is larger than the sum of its proper divisors (2572298635).

12861493145 is an equidigital number, since it uses as much as digits as its factorization.

12861493145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572298634.

The product of its digits is 207360, while the sum is 44.

The spelling of 12861493145 in words is "twelve billion, eight hundred sixty-one million, four hundred ninety-three thousand, one hundred forty-five".