25535543400261 has 12 divisors (see below), whose sum is σ = 36885240823392. Its totient is φ = 17023433897256.

The previous prime is 25535543400259. The next prime is 25535543400299. The reversal of 25535543400261 is 16200434553552.

25535543400261 is a `hidden beast` number, since 2 + 5 + 5 + 3 + 5 + 543 + 40 + 0 + 2 + 61 = 666.

It is not a de Polignac number, because 25535543400261 - 2¹ = 25535543400259 is a prime.

It is a super-2 number, since 2×25535543400261² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25535543400061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21189681 + ... + 22362326.

It is an arithmetic number, because the mean of its divisors is an integer number (3073770068616).

Almost surely, 2^{25535543400261} is an apocalyptic number.

It is an amenable number.

25535543400261 is a deficient number, since it is larger than the sum of its proper divisors (11349697423131).

25535543400261 is a wasteful number, since it uses less digits than its factorization.

25535543400261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43617160 (or 43617157 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 45.

The spelling of 25535543400261 in words is "twenty-five trillion, five hundred thirty-five billion, five hundred forty-three million, four hundred thousand, two hundred sixty-one".