25291355208 has 128 divisors (see below), whose sum is σ = 74728120320. Its totient is φ = 6980244480.

The previous prime is 25291355207. The next prime is 25291355249. The reversal of 25291355208 is 80255319252.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 25291355208.

It is not an unprimeable number, because it can be changed into a prime (25291355207) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 3052960 + ... + 3061232.

It is an arithmetic number, because the mean of its divisors is an integer number (583813440).

Almost surely, 2^25291355208 is an apocalyptic number.

25291355208 is a gapful number since it is divisible by the number (28) 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 25291355208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37364060160).

25291355208 is an abundant number, since it is smaller than the sum of its proper divisors (49436765112).

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

25291355208 is a wasteful number, since it uses less digits than its factorization.

25291355208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8907 (or 8903 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 25291355208 in words is "twenty-five billion, two hundred ninety-one million, three hundred fifty-five thousand, two hundred eight".