25561165404 has 24 divisors (see below), whose sum is σ = 59925392128. Its totient is φ = 8480006640.

The previous prime is 25561165387. The next prime is 25561165411. The reversal of 25561165404 is 40456116552.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5045092 + ... + 5050155.

Almost surely, 2^25561165404 is an apocalyptic number.

It is an amenable number.

25561165404 is an abundant number, since it is smaller than the sum of its proper divisors (34364226724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25561165404 is a wasteful number, since it uses less digits than its factorization.

25561165404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10095465 (or 10095463 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 25561165404 in words is "twenty-five billion, five hundred sixty-one million, one hundred sixty-five thousand, four hundred four".