25921828019 has 2 divisors, whose sum is σ = 25921828020. Its totient is φ = 25921828018.

The previous prime is 25921827989. The next prime is 25921828057. The reversal of 25921828019 is 91082812952.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25921828019 is a prime.

It is a super-2 number, since 2×25921828019² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25921828099) 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, 12960914009 + 12960914010.

It is an arithmetic number, because the mean of its divisors is an integer number (12960914010).

Almost surely, 2^25921828019 is an apocalyptic number.

25921828019 is a deficient number, since it is larger than the sum of its proper divisors (1).

25921828019 is an equidigital number, since it uses as much as digits as its factorization.

25921828019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 47.

The spelling of 25921828019 in words is "twenty-five billion, nine hundred twenty-one million, eight hundred twenty-eight thousand, nineteen".