12749166566 has 4 divisors (see below), whose sum is σ = 19123749852. Its totient is φ = 6374583282.

The previous prime is 12749166559. The next prime is 12749166581. The reversal of 12749166566 is 66566194721.

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

It is a super-2 number, since 2×12749166566² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3187291640 + ... + 3187291643.

It is an arithmetic number, because the mean of its divisors is an integer number (4780937463).

Almost surely, 2^12749166566 is an apocalyptic number.

12749166566 is a deficient number, since it is larger than the sum of its proper divisors (6374583286).

12749166566 is an equidigital number, since it uses as much as digits as its factorization.

12749166566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6374583285.

The product of its digits is 3265920, while the sum is 53.

The spelling of 12749166566 in words is "twelve billion, seven hundred forty-nine million, one hundred sixty-six thousand, five hundred sixty-six".