25404863409 has 16 divisors (see below), whose sum is σ = 38101490240. Its totient is φ = 16936574148.

The previous prime is 25404863389. The next prime is 25404863443. The reversal of 25404863409 is 90436840452.

25404863409 is a `hidden beast` number, since 2 + 5 + 4 + 0 + 4 + 8 + 634 + 0 + 9 = 666.

It is not a de Polignac number, because 25404863409 - 2²³ = 25396474801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25404862409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5805967 + ... + 5810340.

It is an arithmetic number, because the mean of its divisors is an integer number (2381343140).

Almost surely, 2^25404863409 is an apocalyptic number.

It is an amenable number.

25404863409 is a deficient number, since it is larger than the sum of its proper divisors (12696626831).

25404863409 is an frugal number, since it uses more digits than its factorization.

25404863409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11616328 (or 11616310 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 25404863409 in words is "twenty-five billion, four hundred four million, eight hundred sixty-three thousand, four hundred nine".