25020021749 has 2 divisors, whose sum is σ = 25020021750. Its totient is φ = 25020021748.

The previous prime is 25020021743. The next prime is 25020021811. The reversal of 25020021749 is 94712002052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23353341124 + 1666680625 = 152818^2 + 40825^2 .

It is a cyclic number.

It is not a de Polignac number, because 25020021749 - 2²⁴ = 25003244533 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 (25020021743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12510010874 + 12510010875.

It is an arithmetic number, because the mean of its divisors is an integer number (12510010875).

Almost surely, 2^25020021749 is an apocalyptic number.

It is an amenable number.

25020021749 is a deficient number, since it is larger than the sum of its proper divisors (1).

25020021749 is an equidigital number, since it uses as much as digits as its factorization.

25020021749 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 32.

The spelling of 25020021749 in words is "twenty-five billion, twenty million, twenty-one thousand, seven hundred forty-nine".