12127789647 has 24 divisors (see below), whose sum is σ = 19187990640. Its totient is φ = 7347191040.

The previous prime is 12127789643. The next prime is 12127789679. The reversal of 12127789647 is 74698772121.

It is not a de Polignac number, because 12127789647 - 2² = 12127789643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12127789593 and 12127789602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12127789643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1362229 + ... + 1371102.

It is an arithmetic number, because the mean of its divisors is an integer number (799499610).

Almost surely, 2^12127789647 is an apocalyptic number.

12127789647 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

12127789647 is a deficient number, since it is larger than the sum of its proper divisors (7060200993).

12127789647 is a wasteful number, since it uses less digits than its factorization.

12127789647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2733383 (or 2733380 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The spelling of 12127789647 in words is "twelve billion, one hundred twenty-seven million, seven hundred eighty-nine thousand, six hundred forty-seven".