25259393820 has 144 divisors (see below), whose sum is σ = 77220531360. Its totient is φ = 6161121792.

The previous prime is 25259393779. The next prime is 25259393833. The reversal of 25259393820 is 2839395252.

It is a self number, because there is not a number n which added to its sum of digits gives 25259393820.

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 47 ways as a sum of consecutive naturals, for example, 608034 + ... + 648246.

It is an arithmetic number, because the mean of its divisors is an integer number (536253690).

Almost surely, 2^25259393820 is an apocalyptic number.

25259393820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25259393820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38610265680).

25259393820 is an abundant number, since it is smaller than the sum of its proper divisors (51961137540).

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

25259393820 is a wasteful number, since it uses less digits than its factorization.

25259393820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40292 (or 40271 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 25259393820 in words is "twenty-five billion, two hundred fifty-nine million, three hundred ninety-three thousand, eight hundred twenty".