25666498560 has 416 divisors, whose sum is σ = 87981562368. Its totient is φ = 6372720640.

The previous prime is 25666498523. The next prime is 25666498589. The reversal of 25666498560 is 6589466652.

It is a self number, because there is not a number n which added to its sum of digits gives 25666498560.

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 31 ways as a sum of consecutive naturals, for example, 57937699 + ... + 57938141.

Almost surely, 2^25666498560 is an apocalyptic number.

25666498560 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 25666498560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43990781184).

25666498560 is an abundant number, since it is smaller than the sum of its proper divisors (62315063808).

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

25666498560 is a wasteful number, since it uses less digits than its factorization.

25666498560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539 (or 517 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 57.

The spelling of 25666498560 in words is "twenty-five billion, six hundred sixty-six million, four hundred ninety-eight thousand, five hundred sixty".