12020531553 has 12 divisors (see below), whose sum is σ = 17389266388. Its totient is φ = 8001560160.

The previous prime is 12020531539. The next prime is 12020531563. The reversal of 12020531553 is 35513502021.

It is a happy number.

12020531553 is a `hidden beast` number, since 120 + 2 + 0 + 531 + 5 + 5 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5014339344 + 7006192209 = 70812^2 + 83703^2 .

It is not a de Polignac number, because 12020531553 - 2⁶ = 12020531489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12020531563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1004350 + ... + 1016247.

Almost surely, 2^12020531553 is an apocalyptic number.

It is an amenable number.

12020531553 is a deficient number, since it is larger than the sum of its proper divisors (5368734835).

12020531553 is a wasteful number, since it uses less digits than its factorization.

12020531553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021264 (or 2021261 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The spelling of 12020531553 in words is "twelve billion, twenty million, five hundred thirty-one thousand, five hundred fifty-three".