25520653597 has 2 divisors, whose sum is σ = 25520653598. Its totient is φ = 25520653596.

The previous prime is 25520653577. The next prime is 25520653607. The reversal of 25520653597 is 79535602552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25282908036 + 237745561 = 159006^2 + 15419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25520653597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25520653597.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25520653577) 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, 12760326798 + 12760326799.

It is an arithmetic number, because the mean of its divisors is an integer number (12760326799).

Almost surely, 2^25520653597 is an apocalyptic number.

It is an amenable number.

25520653597 is a deficient number, since it is larger than the sum of its proper divisors (1).

25520653597 is an equidigital number, since it uses as much as digits as its factorization.

25520653597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2835000, while the sum is 49.

It can be divided in two parts, 255206 and 53597, that added together give a palindrome (308803).

The spelling of 25520653597 in words is "twenty-five billion, five hundred twenty million, six hundred fifty-three thousand, five hundred ninety-seven".