25665885504 has 392 divisors, whose sum is σ = 88350425280. Its totient is φ = 7242504192.

The previous prime is 25665885437. The next prime is 25665885517. The reversal of 25665885504 is 40558856652.

It is a happy number.

25665885504 is a `hidden beast` number, since 2 + 5 + 6 + 6 + 5 + 88 + 550 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 29066247 + ... + 29067129.

Almost surely, 2^25665885504 is an apocalyptic number.

25665885504 is a gapful number since it is divisible by the number (24) 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 25665885504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44175212640).

25665885504 is an abundant number, since it is smaller than the sum of its proper divisors (62684539776).

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

25665885504 is an frugal number, since it uses more digits than its factorization.

25665885504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009 (or 984 counting only the distinct ones).

The product of its (nonzero) digits is 11520000, while the sum is 54.

The spelling of 25665885504 in words is "twenty-five billion, six hundred sixty-five million, eight hundred eighty-five thousand, five hundred four".