25967066449 has 9 divisors (see below), whose sum is σ = 27587302747. Its totient is φ = 24437013664.

The previous prime is 25967066443. The next prime is 25967066453. The reversal of 25967066449 is 94466076952.

The square root of 25967066449 is 161143.

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

It can be written as a sum of positive squares in only one way, i.e., 20216574225 + 5750492224 = 142185^2 + 75832^2 .

It is not a de Polignac number, because 25967066449 - 2³ = 25967066441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25967066393 and 25967066402.

It is not an unprimeable number, because it can be changed into a prime (25967066441) 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, 2734692 + ... + 2744170.

Almost surely, 2^25967066449 is an apocalyptic number.

25967066449 is the 161143-rd square number.

25967066449 is the 80572-nd centered octagonal number.

It is an amenable number.

25967066449 is a deficient number, since it is larger than the sum of its proper divisors (1620236298).

25967066449 is an frugal number, since it uses more digits than its factorization.

25967066449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18992 (or 9496 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 58.

The spelling of 25967066449 in words is "twenty-five billion, nine hundred sixty-seven million, sixty-six thousand, four hundred forty-nine".