25071820901 has 2 divisors, whose sum is σ = 25071820902. Its totient is φ = 25071820900.

The previous prime is 25071820853. The next prime is 25071820909. The reversal of 25071820901 is 10902817052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24064075876 + 1007745025 = 155126^2 + 31745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25071820901 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25071820909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12535910450 + 12535910451.

It is an arithmetic number, because the mean of its divisors is an integer number (12535910451).

Almost surely, 2^25071820901 is an apocalyptic number.

It is an amenable number.

25071820901 is a deficient number, since it is larger than the sum of its proper divisors (1).

25071820901 is an equidigital number, since it uses as much as digits as its factorization.

25071820901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The spelling of 25071820901 in words is "twenty-five billion, seventy-one million, eight hundred twenty thousand, nine hundred one".