25216074876721 has 3 divisors (see below), whose sum is σ = 25216079898283. Its totient is φ = 25216069855160.

The previous prime is 25216074876719. The next prime is 25216074876749. The reversal of 25216074876721 is 12767847061252.

It is a happy number.

The square root of 25216074876721 is 5021561.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1748638614321 + 23467436262400 = 1322361^2 + 4844320^2 .

It is not a de Polignac number, because 25216074876721 - 2¹ = 25216074876719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25216074886721) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2510781 + ... + 7532341.

Almost surely, 2^{25216074876721} is an apocalyptic number.

25216074876721 is the 5021561-st square number.

25216074876721 is the 2510781-st centered octagonal number.

It is an amenable number.

25216074876721 is a deficient number, since it is larger than the sum of its proper divisors (5021562).

25216074876721 is an frugal number, since it uses more digits than its factorization.

25216074876721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10043122 (or 5021561 counting only the distinct ones).

The product of its (nonzero) digits is 15805440, while the sum is 58.

The spelling of 25216074876721 in words is "twenty-five trillion, two hundred sixteen billion, seventy-four million, eight hundred seventy-six thousand, seven hundred twenty-one".