12521303666 has 8 divisors (see below), whose sum is σ = 18782434524. Its totient is φ = 6260492160.

The previous prime is 12521303659. The next prime is 12521303719. The reversal of 12521303666 is 66630312521.

It can be written as a sum of positive squares in 2 ways, for example, as 12299919025 + 221384641 = 110905^2 + 14879^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93146 + ... + 183626.

Almost surely, 2^12521303666 is an apocalyptic number.

12521303666 is a deficient number, since it is larger than the sum of its proper divisors (6261130858).

12521303666 is an equidigital number, since it uses as much as digits as its factorization.

12521303666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159676.

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 12521303666 in words is "twelve billion, five hundred twenty-one million, three hundred three thousand, six hundred sixty-six".