25529331081 has 4 divisors (see below), whose sum is σ = 34039108112. Its totient is φ = 17019554052.

The previous prime is 25529331059. The next prime is 25529331089. The reversal of 25529331081 is 18013392552.

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 not a de Polignac number, because 25529331081 - 2²⁷ = 25395113353 is a prime.

It is a super-2 number, since 2×25529331081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25529331089) 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 3 ways as a sum of consecutive naturals, for example, 4254888511 + ... + 4254888516.

It is an arithmetic number, because the mean of its divisors is an integer number (8509777028).

Almost surely, 2^25529331081 is an apocalyptic number.

It is an amenable number.

25529331081 is a deficient number, since it is larger than the sum of its proper divisors (8509777031).

25529331081 is an equidigital number, since it uses as much as digits as its factorization.

25529331081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8509777030.

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 25529331081 in words is "twenty-five billion, five hundred twenty-nine million, three hundred thirty-one thousand, eighty-one".