12966011549 has 4 divisors (see below), whose sum is σ = 12966649440. Its totient is φ = 12965373660.

The previous prime is 12966011543. The next prime is 12966011557. The reversal of 12966011549 is 94511066921.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12966011549 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 (12966011543) 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, 287417 + ... + 329454.

It is an arithmetic number, because the mean of its divisors is an integer number (3241662360).

Almost surely, 2^12966011549 is an apocalyptic number.

It is an amenable number.

12966011549 is a deficient number, since it is larger than the sum of its proper divisors (637891).

12966011549 is an equidigital number, since it uses as much as digits as its factorization.

12966011549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637890.

The product of its (nonzero) digits is 116640, while the sum is 44.

The spelling of 12966011549 in words is "twelve billion, nine hundred sixty-six million, eleven thousand, five hundred forty-nine".