12005203551 has 16 divisors (see below), whose sum is σ = 17589581568. Its totient is φ = 7222769600.

The previous prime is 12005203549. The next prime is 12005203591. The reversal of 12005203551 is 15530250021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12005203551 - 2¹ = 12005203549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12005203591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1323195 + ... + 1332236.

It is an arithmetic number, because the mean of its divisors is an integer number (1099348848).

Almost surely, 2^12005203551 is an apocalyptic number.

12005203551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12005203551 is a deficient number, since it is larger than the sum of its proper divisors (5584378017).

12005203551 is a wasteful number, since it uses less digits than its factorization.

12005203551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655582.

The product of its (nonzero) digits is 1500, while the sum is 24.

Adding to 12005203551 its reverse (15530250021), we get a palindrome (27535453572).

The spelling of 12005203551 in words is "twelve billion, five million, two hundred three thousand, five hundred fifty-one".