25678620493 has 2 divisors, whose sum is σ = 25678620494. Its totient is φ = 25678620492.

The previous prime is 25678620463. The next prime is 25678620521. The reversal of 25678620493 is 39402687652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17550155529 + 8128464964 = 132477^2 + 90158^2 .

It is a cyclic number.

It is not a de Polignac number, because 25678620493 - 2¹³ = 25678612301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25678620493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25678620413) 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, 12839310246 + 12839310247.

It is an arithmetic number, because the mean of its divisors is an integer number (12839310247).

Almost surely, 2^25678620493 is an apocalyptic number.

It is an amenable number.

25678620493 is a deficient number, since it is larger than the sum of its proper divisors (1).

25678620493 is an equidigital number, since it uses as much as digits as its factorization.

25678620493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 25678620493 in words is "twenty-five billion, six hundred seventy-eight million, six hundred twenty thousand, four hundred ninety-three".