25144225861 has 2 divisors, whose sum is σ = 25144225862. Its totient is φ = 25144225860.

The previous prime is 25144225811. The next prime is 25144225867. The reversal of 25144225861 is 16852244152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24486303361 + 657922500 = 156481^2 + 25650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25144225861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25144225867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12572112930 + 12572112931.

It is an arithmetic number, because the mean of its divisors is an integer number (12572112931).

Almost surely, 2^25144225861 is an apocalyptic number.

It is an amenable number.

25144225861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25144225861 is an equidigital number, since it uses as much as digits as its factorization.

25144225861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 153600, while the sum is 40.

The spelling of 25144225861 in words is "twenty-five billion, one hundred forty-four million, two hundred twenty-five thousand, eight hundred sixty-one".