12633647566 has 4 divisors (see below), whose sum is σ = 18950471352. Its totient is φ = 6316823782.

The previous prime is 12633647557. The next prime is 12633647573. The reversal of 12633647566 is 66574633621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66574633621 = 36559 ⋅1821019.

It is a super-3 number, since 3×12633647566³ (a number of 31 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3158411890 + ... + 3158411893.

It is an arithmetic number, because the mean of its divisors is an integer number (4737617838).

Almost surely, 2^12633647566 is an apocalyptic number.

12633647566 is a deficient number, since it is larger than the sum of its proper divisors (6316823786).

12633647566 is an equidigital number, since it uses as much as digits as its factorization.

12633647566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6316823785.

The product of its digits is 3265920, while the sum is 49.

The spelling of 12633647566 in words is "twelve billion, six hundred thirty-three million, six hundred forty-seven thousand, five hundred sixty-six".