12135440551 has 4 divisors (see below), whose sum is σ = 13068935992. Its totient is φ = 11201945112.

The previous prime is 12135440549. The next prime is 12135440563. The reversal of 12135440551 is 15504453121.

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

It is a cyclic number.

It is not a de Polignac number, because 12135440551 - 2¹ = 12135440549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12135440591) 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, 466747701 + ... + 466747726.

It is an arithmetic number, because the mean of its divisors is an integer number (3267233998).

Almost surely, 2^12135440551 is an apocalyptic number.

12135440551 is a deficient number, since it is larger than the sum of its proper divisors (933495441).

12135440551 is an equidigital number, since it uses as much as digits as its factorization.

12135440551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933495440.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 12135440551 its reverse (15504453121), we get a palindrome (27639893672).

The spelling of 12135440551 in words is "twelve billion, one hundred thirty-five million, four hundred forty thousand, five hundred fifty-one".