25388771166 has 96 divisors (see below), whose sum is σ = 64958976000. Its totient is φ = 7288580880.

The previous prime is 25388771137. The next prime is 25388771197. The reversal of 25388771166 is 66117788352.

It is a happy number.

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 47 ways as a sum of consecutive naturals, for example, 155235 + ... + 273633.

It is an arithmetic number, because the mean of its divisors is an integer number (676656000).

Almost surely, 2^25388771166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25388771166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32479488000).

25388771166 is an abundant number, since it is smaller than the sum of its proper divisors (39570204834).

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

25388771166 is a wasteful number, since it uses less digits than its factorization.

25388771166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118459 (or 118434 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 25388771166 in words is "twenty-five billion, three hundred eighty-eight million, seven hundred seventy-one thousand, one hundred sixty-six".