25260287509 has 4 divisors (see below), whose sum is σ = 25260636204. Its totient is φ = 25259938816.

The previous prime is 25260287497. The next prime is 25260287531. The reversal of 25260287509 is 90578206252.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 19382765284 + 5877522225 = 139222^2 + 76665^2 .

It is a cyclic number.

It is not a de Polignac number, because 25260287509 - 2¹⁵ = 25260254741 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 (25260287609) 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, 20332 + ... + 225685.

It is an arithmetic number, because the mean of its divisors is an integer number (6315159051).

Almost surely, 2^25260287509 is an apocalyptic number.

It is an amenable number.

25260287509 is a deficient number, since it is larger than the sum of its proper divisors (348695).

25260287509 is a wasteful number, since it uses less digits than its factorization.

25260287509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348694.

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 25260287509 in words is "twenty-five billion, two hundred sixty million, two hundred eighty-seven thousand, five hundred nine".