25663520000 has 90 divisors (see below), whose sum is σ = 64013398218. Its totient is φ = 10265344000.

The previous prime is 25663519997. The next prime is 25663520041. The reversal of 25663520000 is 2536652.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 14950441984 + 10713078016 = 122272^2 + 103504^2 .

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 9 ways as a sum of consecutive naturals, for example, 79802 + ... + 240198.

Almost surely, 2^25663520000 is an apocalyptic number.

25663520000 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 25663520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32006699109).

25663520000 is an abundant number, since it is smaller than the sum of its proper divisors (38349878218).

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

25663520000 is an frugal number, since it uses more digits than its factorization.

25663520000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160433 (or 160404 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

The spelling of 25663520000 in words is "twenty-five billion, six hundred sixty-three million, five hundred twenty thousand".