12127747665 has 32 divisors (see below), whose sum is σ = 21180082176. Its totient is φ = 5876884160.

The previous prime is 12127747663. The next prime is 12127747699. The reversal of 12127747665 is 56674772121.

It is not a de Polignac number, because 12127747665 - 2¹ = 12127747663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12127747663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 295384 + ... + 333926.

It is an arithmetic number, because the mean of its divisors is an integer number (661877568).

Almost surely, 2^12127747665 is an apocalyptic number.

12127747665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12127747665 is a deficient number, since it is larger than the sum of its proper divisors (9052334511).

12127747665 is a wasteful number, since it uses less digits than its factorization.

12127747665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40469.

The product of its digits is 987840, while the sum is 48.

The spelling of 12127747665 in words is "twelve billion, one hundred twenty-seven million, seven hundred forty-seven thousand, six hundred sixty-five".