25131322081 has 2 divisors, whose sum is σ = 25131322082. Its totient is φ = 25131322080.

The previous prime is 25131322067. The next prime is 25131322121. The reversal of 25131322081 is 18022313152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24554890000 + 576432081 = 156700^2 + 24009^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25131322081 is a prime.

It is a super-2 number, since 2×25131322081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25131322001) 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 as a sum of consecutive naturals, namely, 12565661040 + 12565661041.

It is an arithmetic number, because the mean of its divisors is an integer number (12565661041).

Almost surely, 2^25131322081 is an apocalyptic number.

It is an amenable number.

25131322081 is a deficient number, since it is larger than the sum of its proper divisors (1).

25131322081 is an equidigital number, since it uses as much as digits as its factorization.

25131322081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 25131322081 in words is "twenty-five billion, one hundred thirty-one million, three hundred twenty-two thousand, eighty-one".