25646630129 has 2 divisors, whose sum is σ = 25646630130. Its totient is φ = 25646630128.

The previous prime is 25646630111. The next prime is 25646630147. The reversal of 25646630129 is 92103664652.

It is a balanced prime because it is at equal distance from previous prime (25646630111) and next prime (25646630147).

It can be written as a sum of positive squares in only one way, i.e., 13220400400 + 12426229729 = 114980^2 + 111473^2 .

It is a cyclic number.

It is not a de Polignac number, because 25646630129 - 2³² = 21351662833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25646630129.

It is not a weakly prime, because it can be changed into another prime (25646636129) 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 as a sum of consecutive naturals, namely, 12823315064 + 12823315065.

It is an arithmetic number, because the mean of its divisors is an integer number (12823315065).

Almost surely, 2^25646630129 is an apocalyptic number.

It is an amenable number.

25646630129 is a deficient number, since it is larger than the sum of its proper divisors (1).

25646630129 is an equidigital number, since it uses as much as digits as its factorization.

25646630129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 44.

The spelling of 25646630129 in words is "twenty-five billion, six hundred forty-six million, six hundred thirty thousand, one hundred twenty-nine".