25990165878 has 16 divisors (see below), whose sum is σ = 52097674176. Its totient is φ = 8643831560.

The previous prime is 25990165849. The next prime is 25990165963. The reversal of 25990165878 is 87856109952.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4886388 + ... + 4891703.

It is an arithmetic number, because the mean of its divisors is an integer number (3256104636).

Almost surely, 2^25990165878 is an apocalyptic number.

25990165878 is an abundant number, since it is smaller than the sum of its proper divisors (26107508298).

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

25990165878 is a wasteful number, since it uses less digits than its factorization.

25990165878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9778539.

The product of its (nonzero) digits is 10886400, while the sum is 60.

The spelling of 25990165878 in words is "twenty-five billion, nine hundred ninety million, one hundred sixty-five thousand, eight hundred seventy-eight".