25620413521 has 2 divisors, whose sum is σ = 25620413522. Its totient is φ = 25620413520.

The previous prime is 25620413491. The next prime is 25620413531. The reversal of 25620413521 is 12531402652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23859436225 + 1760977296 = 154465^2 + 41964^2 .

It is a cyclic number.

It is not a de Polignac number, because 25620413521 - 2⁷ = 25620413393 is a prime.

It is not a weakly prime, because it can be changed into another prime (25620413531) 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, 12810206760 + 12810206761.

It is an arithmetic number, because the mean of its divisors is an integer number (12810206761).

Almost surely, 2^25620413521 is an apocalyptic number.

It is an amenable number.

25620413521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25620413521 is an equidigital number, since it uses as much as digits as its factorization.

25620413521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 25620413521 in words is "twenty-five billion, six hundred twenty million, four hundred thirteen thousand, five hundred twenty-one".