25520653577 has 2 divisors, whose sum is σ = 25520653578. Its totient is φ = 25520653576.

The previous prime is 25520653531. The next prime is 25520653597. The reversal of 25520653577 is 77535602552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15426633616 + 10094019961 = 124204^2 + 100469^2 .

It is a cyclic number.

It is not a de Polignac number, because 25520653577 - 2¹⁴ = 25520637193 is a prime.

It is not a weakly prime, because it can be changed into another prime (25520653597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12760326788 + 12760326789.

It is an arithmetic number, because the mean of its divisors is an integer number (12760326789).

Almost surely, 2^25520653577 is an apocalyptic number.

It is an amenable number.

25520653577 is a deficient number, since it is larger than the sum of its proper divisors (1).

25520653577 is an equidigital number, since it uses as much as digits as its factorization.

25520653577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2205000, while the sum is 47.

The spelling of 25520653577 in words is "twenty-five billion, five hundred twenty million, six hundred fifty-three thousand, five hundred seventy-seven".