12505402133 has 4 divisors (see below), whose sum is σ = 14291888160. Its totient is φ = 10718916108.

The previous prime is 12505402109. The next prime is 12505402153. The reversal of 12505402133 is 33120450521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33120450521 = 1103 ⋅30027607.

It is a cyclic number.

It is not a de Polignac number, because 12505402133 - 2¹⁸ = 12505139989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12505402153) 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, 893243003 + ... + 893243016.

It is an arithmetic number, because the mean of its divisors is an integer number (3572972040).

Almost surely, 2^12505402133 is an apocalyptic number.

It is an amenable number.

12505402133 is a deficient number, since it is larger than the sum of its proper divisors (1786486027).

12505402133 is an equidigital number, since it uses as much as digits as its factorization.

12505402133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786486026.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 12505402133 its reverse (33120450521), we get a palindrome (45625852654).

The spelling of 12505402133 in words is "twelve billion, five hundred five million, four hundred two thousand, one hundred thirty-three".