25665850416 has 80 divisors (see below), whose sum is σ = 67261694976. Its totient is φ = 8431815168.

The previous prime is 25665850411. The next prime is 25665850423. The reversal of 25665850416 is 61405856652.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (25665850411) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 8488681 + ... + 8491703.

Almost surely, 2^25665850416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25665850416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33630847488).

25665850416 is an abundant number, since it is smaller than the sum of its proper divisors (41595844560).

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

25665850416 is a wasteful number, since it uses less digits than its factorization.

25665850416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530 (or 5524 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 48.

The spelling of 25665850416 in words is "twenty-five billion, six hundred sixty-five million, eight hundred fifty thousand, four hundred sixteen".