25978553 has 2 divisors, whose sum is σ = 25978554. Its totient is φ = 25978552.

The previous prime is 25978549. The next prime is 25978571. The reversal of 25978553 is 35587952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20720704 + 5257849 = 4552^2 + 2293^2 .

It is a cyclic number.

It is not a de Polignac number, because 25978553 - 2² = 25978549 is a prime.

It is not a weakly prime, because it can be changed into another prime (25978573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12989276 + 12989277.

It is an arithmetic number, because the mean of its divisors is an integer number (12989277).

Almost surely, 2^25978553 is an apocalyptic number.

It is an amenable number.

25978553 is a deficient number, since it is larger than the sum of its proper divisors (1).

25978553 is an equidigital number, since it uses as much as digits as its factorization.

25978553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378000, while the sum is 44.

The square root of 25978553 is about 5096.9160283450. The cubic root of 25978553 is about 296.1681271852.

The spelling of 25978553 in words is "twenty-five million, nine hundred seventy-eight thousand, five hundred fifty-three".