12669762610521 has 27 divisors (see below), whose sum is σ = 18426730528479. Its totient is φ = 8388766830672.

The previous prime is 12669762610507. The next prime is 12669762610541. The reversal of 12669762610521 is 12501626796621.

The square root of 12669762610521 is 3559461.

It is a perfect power (a square), and thus also a powerful number.

12669762610521 is a `hidden beast` number, since 1 + 2 + 6 + 6 + 9 + 7 + 626 + 1 + 0 + 5 + 2 + 1 = 666.

12669762610521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1484349918921 + 11185412691600 = 1218339^2 + 3344460^2 .

It is not a de Polignac number, because 12669762610521 - 2⁹ = 12669762610009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12669762610541) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1591075086 + ... + 1591083048.

Almost surely, 2^{12669762610521} is an apocalyptic number.

12669762610521 is the 3559461-st square number.

12669762610521 is the 1779731-st centered octagonal number.

It is an amenable number.

12669762610521 is a deficient number, since it is larger than the sum of its proper divisors (5756967917958).

12669762610521 is an frugal number, since it uses more digits than its factorization.

12669762610521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16230 (or 8115 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 12669762610521 in words is "twelve trillion, six hundred sixty-nine billion, seven hundred sixty-two million, six hundred ten thousand, five hundred twenty-one".