25400106640261 has 4 divisors (see below), whose sum is σ = 25411281348492. Its totient is φ = 25388931932032.

The previous prime is 25400106640243. The next prime is 25400106640267. The reversal of 25400106640261 is 16204660100452.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21093527087361 + 4306579552900 = 4592769^2 + 2075230^2 .

It is a cyclic number.

It is not a de Polignac number, because 25400106640261 - 2⁷ = 25400106640133 is a prime.

It is a super-2 number, since 2×25400106640261² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25400106640261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25400106640267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5587350706 + ... + 5587355251.

It is an arithmetic number, because the mean of its divisors is an integer number (6352820337123).

Almost surely, 2^{25400106640261} is an apocalyptic number.

It is an amenable number.

25400106640261 is a deficient number, since it is larger than the sum of its proper divisors (11174708231).

25400106640261 is a wasteful number, since it uses less digits than its factorization.

25400106640261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11174708230.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 25400106640261 in words is "twenty-five trillion, four hundred billion, one hundred six million, six hundred forty thousand, two hundred sixty-one".