25386947769487 has 4 divisors (see below), whose sum is σ = 25387079112280. Its totient is φ = 25386816426696.

The previous prime is 25386947769433. The next prime is 25386947769503. The reversal of 25386947769487 is 78496774968352.

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

It is a cyclic number.

It is not a de Polignac number, because 25386947769487 - 2¹⁵ = 25386947736719 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 (25386957769487) 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, 65381037 + ... + 65768182.

It is an arithmetic number, because the mean of its divisors is an integer number (6346769778070).

Almost surely, 2^{25386947769487} is an apocalyptic number.

25386947769487 is a deficient number, since it is larger than the sum of its proper divisors (131342793).

25386947769487 is a wasteful number, since it uses less digits than its factorization.

25386947769487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131342792.

The product of its digits is 30725775360, while the sum is 85.

The spelling of 25386947769487 in words is "twenty-five trillion, three hundred eighty-six billion, nine hundred forty-seven million, seven hundred sixty-nine thousand, four hundred eighty-seven".