25044321605 has 4 divisors (see below), whose sum is σ = 30053185932. Its totient is φ = 20035457280.

The previous prime is 25044321583. The next prime is 25044321607. The reversal of 25044321605 is 50612344052.

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 9856716961 + 15187604644 = 99281^2 + 123238^2 .

It is not a de Polignac number, because 25044321605 - 2¹² = 25044317509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25044321607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2504432156 + ... + 2504432165.

It is an arithmetic number, because the mean of its divisors is an integer number (7513296483).

Almost surely, 2^25044321605 is an apocalyptic number.

It is an amenable number.

25044321605 is a deficient number, since it is larger than the sum of its proper divisors (5008864327).

25044321605 is an equidigital number, since it uses as much as digits as its factorization.

25044321605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5008864326.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 25044321605 its reverse (50612344052), we get a palindrome (75656665657).

The spelling of 25044321605 in words is "twenty-five billion, forty-four million, three hundred twenty-one thousand, six hundred five".