25161891841 has 2 divisors, whose sum is σ = 25161891842. Its totient is φ = 25161891840.

The previous prime is 25161891827. The next prime is 25161891863. The reversal of 25161891841 is 14819816152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21327681600 + 3834210241 = 146040^2 + 61921^2 .

It is a cyclic number.

It is not a de Polignac number, because 25161891841 - 2¹¹ = 25161889793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25161891791 and 25161891800.

It is not a weakly prime, because it can be changed into another prime (25161891541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12580945920 + 12580945921.

It is an arithmetic number, because the mean of its divisors is an integer number (12580945921).

It is a Proth number, since it is equal to 95985 ⋅ 2¹⁸ + 1 and 95985 < 2¹⁸.

Almost surely, 2^25161891841 is an apocalyptic number.

It is an amenable number.

25161891841 is a deficient number, since it is larger than the sum of its proper divisors (1).

25161891841 is an equidigital number, since it uses as much as digits as its factorization.

25161891841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 46.

The spelling of 25161891841 in words is "twenty-five billion, one hundred sixty-one million, eight hundred ninety-one thousand, eight hundred forty-one".