12216545527 has 4 divisors (see below), whose sum is σ = 12447046440. Its totient is φ = 11986044616.

The previous prime is 12216545521. The next prime is 12216545533. The reversal of 12216545527 is 72554561221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (12216545521) and next prime (12216545533).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12216545527 is a prime.

It is a super-2 number, since 2×12216545527² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12216545527.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12216545521) 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, 115250377 + ... + 115250482.

It is an arithmetic number, because the mean of its divisors is an integer number (3111761610).

Almost surely, 2^12216545527 is an apocalyptic number.

12216545527 is a deficient number, since it is larger than the sum of its proper divisors (230500913).

12216545527 is an equidigital number, since it uses as much as digits as its factorization.

12216545527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230500912.

The product of its digits is 168000, while the sum is 40.

The spelling of 12216545527 in words is "twelve billion, two hundred sixteen million, five hundred forty-five thousand, five hundred twenty-seven".