25185437791 has 2 divisors, whose sum is σ = 25185437792. Its totient is φ = 25185437790.

The previous prime is 25185437779. The next prime is 25185437863. The reversal of 25185437791 is 19773458152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25185437791 - 2³¹ = 23037954143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25185437741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12592718895 + 12592718896.

It is an arithmetic number, because the mean of its divisors is an integer number (12592718896).

Almost surely, 2^25185437791 is an apocalyptic number.

25185437791 is a deficient number, since it is larger than the sum of its proper divisors (1).

25185437791 is an equidigital number, since it uses as much as digits as its factorization.

25185437791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 52.

The spelling of 25185437791 in words is "twenty-five billion, one hundred eighty-five million, four hundred thirty-seven thousand, seven hundred ninety-one".