25887618378533 has 2 divisors, whose sum is σ = 25887618378534. Its totient is φ = 25887618378532.

The previous prime is 25887618378529. The next prime is 25887618378539. The reversal of 25887618378533 is 33587381678852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21601236130369 + 4286382248164 = 4647713^2 + 2070358^2 .

It is a cyclic number.

It is not a de Polignac number, because 25887618378533 - 2² = 25887618378529 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25887618378539) 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 as a sum of consecutive naturals, namely, 12943809189266 + 12943809189267.

It is an arithmetic number, because the mean of its divisors is an integer number (12943809189267).

Almost surely, 2^{25887618378533} is an apocalyptic number.

It is an amenable number.

25887618378533 is a deficient number, since it is larger than the sum of its proper divisors (1).

25887618378533 is an equidigital number, since it uses as much as digits as its factorization.

25887618378533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1625702400, while the sum is 74.

The spelling of 25887618378533 in words is "twenty-five trillion, eight hundred eighty-seven billion, six hundred eighteen million, three hundred seventy-eight thousand, five hundred thirty-three".