25343684809 has 9 divisors (see below), whose sum is σ = 25471202421. Its totient is φ = 25216804800.

The previous prime is 25343684801. The next prime is 25343684837. The reversal of 25343684809 is 90848634352.

The square root of 25343684809 is 159197.

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

It can be written as a sum of positive squares in 4 ways, for example, as 14533508025 + 10810176784 = 120555^2 + 103972^2 .

It is not a de Polignac number, because 25343684809 - 2³ = 25343684801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25343684801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 63201009 + ... + 63201409.

Almost surely, 2^25343684809 is an apocalyptic number.

25343684809 is the 159197-th square number.

25343684809 is the 79599-th centered octagonal number.

It is an amenable number.

25343684809 is a deficient number, since it is larger than the sum of its proper divisors (127517612).

25343684809 is an frugal number, since it uses more digits than its factorization.

25343684809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596 (or 798 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 52.

The spelling of 25343684809 in words is "twenty-five billion, three hundred forty-three million, six hundred eighty-four thousand, eight hundred nine".