12521606194 has 8 divisors (see below), whose sum is σ = 18816131628. Its totient is φ = 6249562320.

The previous prime is 12521606183. The next prime is 12521606197. The reversal of 12521606194 is 49160612521.

It can be written as a sum of positive squares in 2 ways, for example, as 12507067225 + 14538969 = 111835^2 + 3813^2 .

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

It is not an unprimeable number, because it can be changed into a prime (12521606197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5618997 + ... + 5621224.

Almost surely, 2^12521606194 is an apocalyptic number.

12521606194 is a deficient number, since it is larger than the sum of its proper divisors (6294525434).

12521606194 is a wasteful number, since it uses less digits than its factorization.

12521606194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11240780.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 12521606194 in words is "twelve billion, five hundred twenty-one million, six hundred six thousand, one hundred ninety-four".