25555539408 has 320 divisors, whose sum is σ = 81464071680. Its totient is φ = 6761545728.

The previous prime is 25555539397. The next prime is 25555539437. The reversal of 25555539408 is 80493555552.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 186536716 + ... + 186536852.

It is an arithmetic number, because the mean of its divisors is an integer number (254575224).

Almost surely, 2^25555539408 is an apocalyptic number.

25555539408 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 25555539408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40732035840).

25555539408 is an abundant number, since it is smaller than the sum of its proper divisors (55908532272).

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

25555539408 is a wasteful number, since it uses less digits than its factorization.

25555539408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 5400000, while the sum is 51.

The spelling of 25555539408 in words is "twenty-five billion, five hundred fifty-five million, five hundred thirty-nine thousand, four hundred eight".