12381664927 has 16 divisors (see below), whose sum is σ = 13631016960. Its totient is φ = 11194290688.

The previous prime is 12381664921. The next prime is 12381664949. The reversal of 12381664927 is 72946618321.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12381664927 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 (12381664921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33378 + ... + 160864.

It is an arithmetic number, because the mean of its divisors is an integer number (851938560).

Almost surely, 2^12381664927 is an apocalyptic number.

12381664927 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

12381664927 is a deficient number, since it is larger than the sum of its proper divisors (1249352033).

12381664927 is a wasteful number, since it uses less digits than its factorization.

12381664927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127730.

The product of its digits is 870912, while the sum is 49.

The spelling of 12381664927 in words is "twelve billion, three hundred eighty-one million, six hundred sixty-four thousand, nine hundred twenty-seven".