25918553 has 2 divisors, whose sum is σ = 25918554. Its totient is φ = 25918552.

The previous prime is 25918517. The next prime is 25918561. The reversal of 25918553 is 35581952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25321024 + 597529 = 5032^2 + 773^2 .

It is a cyclic number.

It is not a de Polignac number, because 25918553 - 2⁸ = 25918297 is a prime.

It is a super-2 number, since 2×25918553² = 1343542779227618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25918513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12959276 + 12959277.

It is an arithmetic number, because the mean of its divisors is an integer number (12959277).

Almost surely, 2^25918553 is an apocalyptic number.

It is an amenable number.

25918553 is a deficient number, since it is larger than the sum of its proper divisors (1).

25918553 is an equidigital number, since it uses as much as digits as its factorization.

25918553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54000, while the sum is 38.

The square root of 25918553 is about 5091.0267137386. The cubic root of 25918553 is about 295.9399417047.

The spelling of 25918553 in words is "twenty-five million, nine hundred eighteen thousand, five hundred fifty-three".