25958423021 has 2 divisors, whose sum is σ = 25958423022. Its totient is φ = 25958423020.

The previous prime is 25958422999. The next prime is 25958423033. The reversal of 25958423021 is 12032485952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25956432100 + 1990921 = 161110^2 + 1411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25958423021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25958423021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25958420021) 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, 12979211510 + 12979211511.

It is an arithmetic number, because the mean of its divisors is an integer number (12979211511).

Almost surely, 2^25958423021 is an apocalyptic number.

It is an amenable number.

25958423021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25958423021 is an equidigital number, since it uses as much as digits as its factorization.

25958423021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 25958423021 in words is "twenty-five billion, nine hundred fifty-eight million, four hundred twenty-three thousand, twenty-one".