12005520417 has 54 divisors (see below), whose sum is σ = 19240370786. Its totient is φ = 7208087040.

The previous prime is 12005520413. The next prime is 12005520451. The reversal of 12005520417 is 71402550021.

12005520417 is a `hidden beast` number, since 120 + 0 + 5 + 520 + 4 + 17 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8957486736 + 3048033681 = 94644^2 + 55209^2 .

It is not a de Polignac number, because 12005520417 - 2² = 12005520413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12005520413) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 50232184 + ... + 50232422.

Almost surely, 2^12005520417 is an apocalyptic number.

It is an amenable number.

12005520417 is a deficient number, since it is larger than the sum of its proper divisors (7234850369).

12005520417 is a wasteful number, since it uses less digits than its factorization.

12005520417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The spelling of 12005520417 in words is "twelve billion, five million, five hundred twenty thousand, four hundred seventeen".