25288767505 has 4 divisors (see below), whose sum is σ = 30346521012. Its totient is φ = 20231014000.

The previous prime is 25288767479. The next prime is 25288767541. The reversal of 25288767505 is 50576788252.

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 16793827281 + 8494940224 = 129591^2 + 92168^2 .

It is not a de Polignac number, because 25288767505 - 2¹⁹ = 25288243217 is a prime.

It is a Duffinian 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, 2528876746 + ... + 2528876755.

It is an arithmetic number, because the mean of its divisors is an integer number (7586630253).

Almost surely, 2^25288767505 is an apocalyptic number.

It is an amenable number.

25288767505 is a deficient number, since it is larger than the sum of its proper divisors (5057753507).

25288767505 is an equidigital number, since it uses as much as digits as its factorization.

25288767505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5057753506.

The product of its (nonzero) digits is 9408000, while the sum is 55.

The spelling of 25288767505 in words is "twenty-five billion, two hundred eighty-eight million, seven hundred sixty-seven thousand, five hundred five".