12450742730721 has 9 divisors (see below), whose sum is σ = 17984421457041. Its totient is φ = 8300488096692.

The previous prime is 12450742730707. The next prime is 12450742730743. The reversal of 12450742730721 is 12703724705421.

The square root of 12450742730721 is 3528561.

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

12450742730721 is a `hidden beast` number, since 1 + 2 + 4 + 507 + 4 + 2 + 73 + 0 + 72 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 12450742730721 - 2²⁵ = 12450709176289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12450742737721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9997590 + ... + 11173776.

Almost surely, 2^{12450742730721} is an apocalyptic number.

12450742730721 is the 3528561-st square number.

12450742730721 is the 1764281-st centered octagonal number.

It is an amenable number.

12450742730721 is a deficient number, since it is larger than the sum of its proper divisors (5533678726320).

12450742730721 is an frugal number, since it uses more digits than its factorization.

12450742730721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2352380 (or 1176190 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 45.

The spelling of 12450742730721 in words is "twelve trillion, four hundred fifty billion, seven hundred forty-two million, seven hundred thirty thousand, seven hundred twenty-one".