25920663553 has 2 divisors, whose sum is σ = 25920663554. Its totient is φ = 25920663552.

The previous prime is 25920663523. The next prime is 25920663581. The reversal of 25920663553 is 35536602952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24234082929 + 1686580624 = 155673^2 + 41068^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25920663553 is a prime.

It is not a weakly prime, because it can be changed into another prime (25920663523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12960331776 + 12960331777.

It is an arithmetic number, because the mean of its divisors is an integer number (12960331777).

Almost surely, 2^25920663553 is an apocalyptic number.

It is an amenable number.

25920663553 is a deficient number, since it is larger than the sum of its proper divisors (1).

25920663553 is an equidigital number, since it uses as much as digits as its factorization.

25920663553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458000, while the sum is 46.

The spelling of 25920663553 in words is "twenty-five billion, nine hundred twenty million, six hundred sixty-three thousand, five hundred fifty-three".