25605790369 has 4 divisors (see below), whose sum is σ = 25606356244. Its totient is φ = 25605224496.

The previous prime is 25605790339. The next prime is 25605790433. The reversal of 25605790369 is 96309750652.

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 6833502225 + 18772288144 = 82665^2 + 137012^2 .

It is a cyclic number.

It is not a de Polignac number, because 25605790369 - 2⁷ = 25605790241 is a prime.

It is a super-2 number, since 2×25605790369² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25605790339) 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 3 ways as a sum of consecutive naturals, for example, 208542 + ... + 307735.

It is an arithmetic number, because the mean of its divisors is an integer number (6401589061).

Almost surely, 2^25605790369 is an apocalyptic number.

It is an amenable number.

25605790369 is a deficient number, since it is larger than the sum of its proper divisors (565875).

25605790369 is an equidigital number, since it uses as much as digits as its factorization.

25605790369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565874.

The product of its (nonzero) digits is 3061800, while the sum is 52.

The spelling of 25605790369 in words is "twenty-five billion, six hundred five million, seven hundred ninety thousand, three hundred sixty-nine".