25813831663 has 2 divisors, whose sum is σ = 25813831664. Its totient is φ = 25813831662.

The previous prime is 25813831649. The next prime is 25813831697. The reversal of 25813831663 is 36613831852.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25813831663 - 2²¹ = 25811734511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25813831633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12906915831 + 12906915832.

It is an arithmetic number, because the mean of its divisors is an integer number (12906915832).

Almost surely, 2^25813831663 is an apocalyptic number.

25813831663 is a deficient number, since it is larger than the sum of its proper divisors (1).

25813831663 is an equidigital number, since it uses as much as digits as its factorization.

25813831663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 46.

It can be divided in two parts, 25813 and 831663, that added together give a square (857476 = 926²).

The spelling of 25813831663 in words is "twenty-five billion, eight hundred thirteen million, eight hundred thirty-one thousand, six hundred sixty-three".