25615795553 has 2 divisors, whose sum is σ = 25615795554. Its totient is φ = 25615795552.

The previous prime is 25615795523. The next prime is 25615795567. The reversal of 25615795553 is 35559751652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23450940769 + 2164854784 = 153137^2 + 46528^2 .

It is a cyclic number.

It is not a de Polignac number, because 25615795553 - 2¹² = 25615791457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25615795495 and 25615795504.

It is not a weakly prime, because it can be changed into another prime (25615795523) 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, 12807897776 + 12807897777.

It is an arithmetic number, because the mean of its divisors is an integer number (12807897777).

Almost surely, 2^25615795553 is an apocalyptic number.

It is an amenable number.

25615795553 is a deficient number, since it is larger than the sum of its proper divisors (1).

25615795553 is an equidigital number, since it uses as much as digits as its factorization.

25615795553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7087500, while the sum is 53.

The spelling of 25615795553 in words is "twenty-five billion, six hundred fifteen million, seven hundred ninety-five thousand, five hundred fifty-three".