12635637551 has 4 divisors (see below), whose sum is σ = 12787874232. Its totient is φ = 12483400872.

The previous prime is 12635637523. The next prime is 12635637559. The reversal of 12635637551 is 15573653621.

12635637551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15573653621 = 509 ⋅30596569.

It is a cyclic number.

It is not a de Polignac number, because 12635637551 - 2³⁰ = 11561895727 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 (12635637559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76118216 + ... + 76118381.

It is an arithmetic number, because the mean of its divisors is an integer number (3196968558).

Almost surely, 2^12635637551 is an apocalyptic number.

12635637551 is a deficient number, since it is larger than the sum of its proper divisors (152236681).

12635637551 is an equidigital number, since it uses as much as digits as its factorization.

12635637551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152236680.

The product of its digits is 567000, while the sum is 44.

The spelling of 12635637551 in words is "twelve billion, six hundred thirty-five million, six hundred thirty-seven thousand, five hundred fifty-one".