25919718990 has 32 divisors (see below), whose sum is σ = 67862537856. Its totient is φ = 6283568160.

The previous prime is 25919718961. The next prime is 25919718991. The reversal of 25919718990 is 9981791952.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25919718991) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 39271972 + ... + 39272631.

It is an arithmetic number, because the mean of its divisors is an integer number (2120704308).

Almost surely, 2^25919718990 is an apocalyptic number.

25919718990 is an abundant number, since it is smaller than the sum of its proper divisors (41942818866).

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

25919718990 is a wasteful number, since it uses less digits than its factorization.

25919718990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78544624.

The product of its (nonzero) digits is 3674160, while the sum is 60.

The spelling of 25919718990 in words is "twenty-five billion, nine hundred nineteen million, seven hundred eighteen thousand, nine hundred ninety".