25505410321 has 4 divisors (see below), whose sum is σ = 25986644532. Its totient is φ = 25024176112.

The previous prime is 25505410313. The next prime is 25505410327. The reversal of 25505410321 is 12301450552.

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 17398929025 + 8106481296 = 131905^2 + 90036^2 .

It is a cyclic number.

It is not a de Polignac number, because 25505410321 - 2³ = 25505410313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25505410321.

It is not an unprimeable number, because it can be changed into a prime (25505410327) 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, 240617026 + ... + 240617131.

It is an arithmetic number, because the mean of its divisors is an integer number (6496661133).

Almost surely, 2^25505410321 is an apocalyptic number.

It is an amenable number.

25505410321 is a deficient number, since it is larger than the sum of its proper divisors (481234211).

25505410321 is an equidigital number, since it uses as much as digits as its factorization.

25505410321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481234210.

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 25505410321 its reverse (12301450552), we get a palindrome (37806860873).

The spelling of 25505410321 in words is "twenty-five billion, five hundred five million, four hundred ten thousand, three hundred twenty-one".