12225538665 has 24 divisors (see below), whose sum is σ = 21874514688. Its totient is φ = 6309954720.

The previous prime is 12225538649. The next prime is 12225538669. The reversal of 12225538665 is 56683552221.

12225538665 is a `hidden beast` number, since 12 + 2 + 2 + 553 + 86 + 6 + 5 = 666.

It is not a de Polignac number, because 12225538665 - 2⁴ = 12225538649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12225538665.

It is not an unprimeable number, because it can be changed into a prime (12225538669) 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, 4380519 + ... + 4383308.

It is an arithmetic number, because the mean of its divisors is an integer number (911438112).

Almost surely, 2^12225538665 is an apocalyptic number.

12225538665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12225538665 is a deficient number, since it is larger than the sum of its proper divisors (9648976023).

12225538665 is a wasteful number, since it uses less digits than its factorization.

12225538665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8763869 (or 8763866 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The spelling of 12225538665 in words is "twelve billion, two hundred twenty-five million, five hundred thirty-eight thousand, six hundred sixty-five".