12549583749 has 4 divisors (see below), whose sum is σ = 16732778336. Its totient is φ = 8366389164.

The previous prime is 12549583729. The next prime is 12549583759. The reversal of 12549583749 is 94738594521.

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.

It is not a de Polignac number, because 12549583749 - 2¹³ = 12549575557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12549583729) 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, 2091597289 + ... + 2091597294.

It is an arithmetic number, because the mean of its divisors is an integer number (4183194584).

Almost surely, 2^12549583749 is an apocalyptic number.

It is an amenable number.

12549583749 is a deficient number, since it is larger than the sum of its proper divisors (4183194587).

12549583749 is an equidigital number, since it uses as much as digits as its factorization.

12549583749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4183194586.

The product of its digits is 10886400, while the sum is 57.

The spelling of 12549583749 in words is "twelve billion, five hundred forty-nine million, five hundred eighty-three thousand, seven hundred forty-nine".