25525370405 has 4 divisors (see below), whose sum is σ = 30630444492. Its totient is φ = 20420296320.

The previous prime is 25525370371. The next prime is 25525370411. The reversal of 25525370405 is 50407352552.

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 13057861441 + 12467508964 = 114271^2 + 111658^2 .

It is not a de Polignac number, because 25525370405 - 2¹² = 25525366309 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, 2552537036 + ... + 2552537045.

It is an arithmetic number, because the mean of its divisors is an integer number (7657611123).

Almost surely, 2^25525370405 is an apocalyptic number.

It is an amenable number.

25525370405 is a deficient number, since it is larger than the sum of its proper divisors (5105074087).

25525370405 is an equidigital number, since it uses as much as digits as its factorization.

25525370405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105074086.

The product of its (nonzero) digits is 210000, while the sum is 38.

The spelling of 25525370405 in words is "twenty-five billion, five hundred twenty-five million, three hundred seventy thousand, four hundred five".