25611625817 has 2 divisors, whose sum is σ = 25611625818. Its totient is φ = 25611625816.

The previous prime is 25611625777. The next prime is 25611625847. The reversal of 25611625817 is 71852611652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22711695616 + 2899930201 = 150704^2 + 53851^2 .

It is a cyclic number.

It is not a de Polignac number, because 25611625817 - 2¹⁴ = 25611609433 is a prime.

It is not a weakly prime, because it can be changed into another prime (25611625847) 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, 12805812908 + 12805812909.

It is an arithmetic number, because the mean of its divisors is an integer number (12805812909).

Almost surely, 2^25611625817 is an apocalyptic number.

It is an amenable number.

25611625817 is a deficient number, since it is larger than the sum of its proper divisors (1).

25611625817 is an equidigital number, since it uses as much as digits as its factorization.

25611625817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 44.

The spelling of 25611625817 in words is "twenty-five billion, six hundred eleven million, six hundred twenty-five thousand, eight hundred seventeen".