25641552243 has 8 divisors (see below), whose sum is σ = 34393459968. Its totient is φ = 16992006344.

The previous prime is 25641552241. The next prime is 25641552247. The reversal of 25641552243 is 34225514652.

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

It is a cyclic number.

It is not a de Polignac number, because 25641552243 - 2¹ = 25641552241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25641552241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25589871 + ... + 25590872.

It is an arithmetic number, because the mean of its divisors is an integer number (4299182496).

Almost surely, 2^25641552243 is an apocalyptic number.

25641552243 is a deficient number, since it is larger than the sum of its proper divisors (8751907725).

25641552243 is a wasteful number, since it uses less digits than its factorization.

25641552243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51180913.

The product of its digits is 288000, while the sum is 39.

The spelling of 25641552243 in words is "twenty-five billion, six hundred forty-one million, five hundred fifty-two thousand, two hundred forty-three".