25293137509 has 2 divisors, whose sum is σ = 25293137510. Its totient is φ = 25293137508.

The previous prime is 25293137473. The next prime is 25293137567. The reversal of 25293137509 is 90573139252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20136461409 + 5156676100 = 141903^2 + 71810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25293137509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25293137579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12646568754 + 12646568755.

It is an arithmetic number, because the mean of its divisors is an integer number (12646568755).

Almost surely, 2^25293137509 is an apocalyptic number.

It is an amenable number.

25293137509 is a deficient number, since it is larger than the sum of its proper divisors (1).

25293137509 is an equidigital number, since it uses as much as digits as its factorization.

25293137509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 510300, while the sum is 46.

The spelling of 25293137509 in words is "twenty-five billion, two hundred ninety-three million, one hundred thirty-seven thousand, five hundred nine".