12516433745 has 4 divisors (see below), whose sum is σ = 15019720500. Its totient is φ = 10013146992.

The previous prime is 12516433697. The next prime is 12516433751. The reversal of 12516433745 is 54733461521.

12516433745 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1266861649 + 11249572096 = 35593^2 + 106064^2 .

It is a cyclic number.

It is not a de Polignac number, because 12516433745 - 2¹⁶ = 12516368209 is a prime.

It is a super-2 number, since 2×12516433745² (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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1251643370 + ... + 1251643379.

It is an arithmetic number, because the mean of its divisors is an integer number (3754930125).

Almost surely, 2^12516433745 is an apocalyptic number.

It is an amenable number.

12516433745 is a deficient number, since it is larger than the sum of its proper divisors (2503286755).

12516433745 is an equidigital number, since it uses as much as digits as its factorization.

12516433745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2503286754.

The product of its digits is 302400, while the sum is 41.

The spelling of 12516433745 in words is "twelve billion, five hundred sixteen million, four hundred thirty-three thousand, seven hundred forty-five".