25166541621505 has 16 divisors (see below), whose sum is σ = 32100733181520. Its totient is φ = 18875194212352.

The previous prime is 25166541621491. The next prime is 25166541621511. The reversal of 25166541621505 is 50512614566152.

It can be written as a sum of positive squares in 8 ways, for example, as 4054198358016 + 21112343263489 = 2013504^2 + 4594817^2 .

It is a cyclic number.

It is not a de Polignac number, because 25166541621505 - 2²⁵ = 25166508067073 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 576003370 + ... + 576047059.

It is an arithmetic number, because the mean of its divisors is an integer number (2006295823845).

Almost surely, 2^{25166541621505} is an apocalyptic number.

It is an amenable number.

25166541621505 is a deficient number, since it is larger than the sum of its proper divisors (6934191560015).

25166541621505 is a wasteful number, since it uses less digits than its factorization.

25166541621505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152050708.

The product of its (nonzero) digits is 2160000, while the sum is 49.

The spelling of 25166541621505 in words is "twenty-five trillion, one hundred sixty-six billion, five hundred forty-one million, six hundred twenty-one thousand, five hundred five".