25317390149 has 2 divisors, whose sum is σ = 25317390150. Its totient is φ = 25317390148.

The previous prime is 25317390127. The next prime is 25317390157. The reversal of 25317390149 is 94109371352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17175937249 + 8141452900 = 131057^2 + 90230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25317390149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25317390179) 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, 12658695074 + 12658695075.

It is an arithmetic number, because the mean of its divisors is an integer number (12658695075).

Almost surely, 2^25317390149 is an apocalyptic number.

It is an amenable number.

25317390149 is a deficient number, since it is larger than the sum of its proper divisors (1).

25317390149 is an equidigital number, since it uses as much as digits as its factorization.

25317390149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 44.

The spelling of 25317390149 in words is "twenty-five billion, three hundred seventeen million, three hundred ninety thousand, one hundred forty-nine".