25666121320356 has 24 divisors (see below), whose sum is σ = 65331945179424. Its totient is φ = 7777612521280.

The previous prime is 25666121320313. The next prime is 25666121320381. The reversal of 25666121320356 is 65302312166652.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97220156385 + ... + 97220156648.

It is an arithmetic number, because the mean of its divisors is an integer number (2722164382476).

Almost surely, 2^{25666121320356} is an apocalyptic number.

It is an amenable number.

25666121320356 is an abundant number, since it is smaller than the sum of its proper divisors (39665823859068).

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

25666121320356 is a wasteful number, since it uses less digits than its factorization.

25666121320356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194440313051 (or 194440313049 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 48.

The spelling of 25666121320356 in words is "twenty-five trillion, six hundred sixty-six billion, one hundred twenty-one million, three hundred twenty thousand, three hundred fifty-six".