25549231680 has 448 divisors, whose sum is σ = 107492474880. Its totient is φ = 5585614848.

The previous prime is 25549231663. The next prime is 25549231709. The reversal of 25549231680 is 8613294552.

25549231680 is a `hidden beast` number, since 2 + 5 + 549 + 23 + 1 + 6 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (45).

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 63 ways as a sum of consecutive naturals, for example, 1381857 + ... + 1400223.

It is an arithmetic number, because the mean of its divisors is an integer number (239938560).

Almost surely, 2^25549231680 is an apocalyptic number.

25549231680 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 25549231680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53746237440).

25549231680 is an abundant number, since it is smaller than the sum of its proper divisors (81943243200).

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

25549231680 is a wasteful number, since it uses less digits than its factorization.

25549231680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18423 (or 18407 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 25549231680 in words is "twenty-five billion, five hundred forty-nine million, two hundred thirty-one thousand, six hundred eighty".