12520433666 has 16 divisors (see below), whose sum is σ = 21415041144. Its totient is φ = 5438740224.

The previous prime is 12520433657. The next prime is 12520433713. The reversal of 12520433666 is 66633402521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9530640625 + 2989793041 = 97625^2 + 54679^2 .

It is a super-2 number, since 2×12520433666² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14162945 + ... + 14163828.

Almost surely, 2^12520433666 is an apocalyptic number.

12520433666 is a deficient number, since it is larger than the sum of its proper divisors (8894607478).

12520433666 is a wasteful number, since it uses less digits than its factorization.

12520433666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28326805.

The product of its (nonzero) digits is 155520, while the sum is 38.

The spelling of 12520433666 in words is "twelve billion, five hundred twenty million, four hundred thirty-three thousand, six hundred sixty-six".