25405405842 has 8 divisors (see below), whose sum is σ = 50810811696. Its totient is φ = 8468468612.

The previous prime is 25405405819. The next prime is 25405405853. The reversal of 25405405842 is 24850450452.

It is a sphenic number, since it is the product of 3 distinct primes.

25405405842 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 25405405842.

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 3 ways as a sum of consecutive naturals, for example, 2117117148 + ... + 2117117159.

It is an arithmetic number, because the mean of its divisors is an integer number (6351351462).

Almost surely, 2^25405405842 is an apocalyptic number.

25405405842 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25405405842 is a wasteful number, since it uses less digits than its factorization.

25405405842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4234234312.

The product of its (nonzero) digits is 256000, while the sum is 39.

The spelling of 25405405842 in words is "twenty-five billion, four hundred five million, four hundred five thousand, eight hundred forty-two".