25533320405 has 4 divisors (see below), whose sum is σ = 30639984492. Its totient is φ = 20426656320.

The previous prime is 25533320389. The next prime is 25533320419. The reversal of 25533320405 is 50402333552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3055215076 + 22478105329 = 55274^2 + 149927^2 .

It is not a de Polignac number, because 25533320405 - 2⁴ = 25533320389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2553332036 + ... + 2553332045.

It is an arithmetic number, because the mean of its divisors is an integer number (7659996123).

Almost surely, 2^25533320405 is an apocalyptic number.

It is an amenable number.

25533320405 is a deficient number, since it is larger than the sum of its proper divisors (5106664087).

25533320405 is an equidigital number, since it uses as much as digits as its factorization.

25533320405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5106664086.

The product of its (nonzero) digits is 54000, while the sum is 32.

Adding to 25533320405 its reverse (50402333552), we get a palindrome (75935653957).

The spelling of 25533320405 in words is "twenty-five billion, five hundred thirty-three million, three hundred twenty thousand, four hundred five".