25906887481 has 4 divisors (see below), whose sum is σ = 25911206272. Its totient is φ = 25902568692.

The previous prime is 25906887473. The next prime is 25906887491. The reversal of 25906887481 is 18478860952.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25906887481 - 2³ = 25906887473 is a prime.

It is a super-2 number, since 2×25906887481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25906887451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2150385 + ... + 2162398.

It is an arithmetic number, because the mean of its divisors is an integer number (6477801568).

Almost surely, 2^25906887481 is an apocalyptic number.

It is an amenable number.

25906887481 is a deficient number, since it is larger than the sum of its proper divisors (4318791).

25906887481 is an equidigital number, since it uses as much as digits as its factorization.

25906887481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4318790.

The product of its (nonzero) digits is 7741440, while the sum is 58.

The spelling of 25906887481 in words is "twenty-five billion, nine hundred six million, eight hundred eighty-seven thousand, four hundred eighty-one".