25425277805 has 4 divisors (see below), whose sum is σ = 30510333372. Its totient is φ = 20340222240.

The previous prime is 25425277799. The next prime is 25425277811. The reversal of 25425277805 is 50877252452.

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

It is an interprime number because it is at equal distance from previous prime (25425277799) and next prime (25425277811).

It can be written as a sum of positive squares in 2 ways, for example, as 3427048681 + 21998229124 = 58541^2 + 148318^2 .

It is not a de Polignac number, because 25425277805 - 2⁴ = 25425277789 is a prime.

It is a super-2 number, since 2×25425277805² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25425277805.

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, 2542527776 + ... + 2542527785.

It is an arithmetic number, because the mean of its divisors is an integer number (7627583343).

Almost surely, 2^25425277805 is an apocalyptic number.

It is an amenable number.

25425277805 is a deficient number, since it is larger than the sum of its proper divisors (5085055567).

25425277805 is an equidigital number, since it uses as much as digits as its factorization.

25425277805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5085055566.

The product of its (nonzero) digits is 1568000, while the sum is 47.

The spelling of 25425277805 in words is "twenty-five billion, four hundred twenty-five million, two hundred seventy-seven thousand, eight hundred five".