25952243409 has 9 divisors (see below), whose sum is σ = 37487271913. Its totient is φ = 17301173412.

The previous prime is 25952243399. The next prime is 25952243411. The reversal of 25952243409 is 90434225952.

The square root of 25952243409 is 161097.

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

25952243409 is a `hidden beast` number, since 2 + 595 + 2 + 24 + 34 + 0 + 9 = 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 25952243409 - 2¹⁷ = 25952112337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25952243419) 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, 456442 + ... + 510140.

Almost surely, 2^25952243409 is an apocalyptic number.

25952243409 is the 161097-th square number.

25952243409 is the 80549-th centered octagonal number.

It is an amenable number.

25952243409 is a deficient number, since it is larger than the sum of its proper divisors (11535028504).

25952243409 is an frugal number, since it uses more digits than its factorization.

25952243409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107404 (or 53702 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

It can be divided in two parts, 25952 and 243409, that added together give a square (269361 = 519²).

The spelling of 25952243409 in words is "twenty-five billion, nine hundred fifty-two million, two hundred forty-three thousand, four hundred nine".