12651402448161 has 45 divisors (see below), whose sum is σ = 19757580368449. Its totient is φ = 8067091473144.

The previous prime is 12651402448147. The next prime is 12651402448177. The reversal of 12651402448161 is 16184420415621.

The square root of 12651402448161 is 3556881.

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

12651402448161 is a `hidden beast` number, since 1 + 2 + 6 + 5 + 1 + 40 + 2 + 448 + 161 = 666.

It is not a de Polignac number, because 12651402448161 - 2⁷ = 12651402448033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12651402448361) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 736265776 + ... + 736282958.

Almost surely, 2^{12651402448161} is an apocalyptic number.

12651402448161 is the 3556881-st square number.

12651402448161 is the 1778441-st centered octagonal number.

It is an amenable number.

12651402448161 is a deficient number, since it is larger than the sum of its proper divisors (7106177920288).

12651402448161 is an frugal number, since it uses more digits than its factorization.

12651402448161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34424 (or 17209 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 12651402448161 in words is "twelve trillion, six hundred fifty-one billion, four hundred two million, four hundred forty-eight thousand, one hundred sixty-one".