25666161522 has 8 divisors (see below), whose sum is σ = 51332323056. Its totient is φ = 8555387172.

The previous prime is 25666161509. The next prime is 25666161523. The reversal of 25666161522 is 22516166652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

25666161522 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (25666161523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2138846788 + ... + 2138846799.

It is an arithmetic number, because the mean of its divisors is an integer number (6416540382).

Almost surely, 2^25666161522 is an apocalyptic number.

25666161522 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25666161522 is a wasteful number, since it uses less digits than its factorization.

25666161522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4277693592.

The product of its digits is 259200, while the sum is 42.

The spelling of 25666161522 in words is "twenty-five billion, six hundred sixty-six million, one hundred sixty-one thousand, five hundred twenty-two".