25404613049 has 4 divisors (see below), whose sum is σ = 25404960000. Its totient is φ = 25404266100.

The previous prime is 25404613027. The next prime is 25404613097. The reversal of 25404613049 is 94031640452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25404613049 - 2²⁴ = 25387835833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25404613009) 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, 15977 + ... + 225974.

It is an arithmetic number, because the mean of its divisors is an integer number (6351240000).

Almost surely, 2^25404613049 is an apocalyptic number.

It is an amenable number.

25404613049 is a deficient number, since it is larger than the sum of its proper divisors (346951).

25404613049 is a wasteful number, since it uses less digits than its factorization.

25404613049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346950.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 25404613049 in words is "twenty-five billion, four hundred four million, six hundred thirteen thousand, forty-nine".