25279340557 has 2 divisors, whose sum is σ = 25279340558. Its totient is φ = 25279340556.

The previous prime is 25279340543. The next prime is 25279340591. The reversal of 25279340557 is 75504397252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16658032356 + 8621308201 = 129066^2 + 92851^2 .

It is a cyclic number.

It is not a de Polignac number, because 25279340557 - 2¹¹ = 25279338509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25279340557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25279340057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12639670278 + 12639670279.

It is an arithmetic number, because the mean of its divisors is an integer number (12639670279).

Almost surely, 2^25279340557 is an apocalyptic number.

It is an amenable number.

25279340557 is a deficient number, since it is larger than the sum of its proper divisors (1).

25279340557 is an equidigital number, since it uses as much as digits as its factorization.

25279340557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646000, while the sum is 49.

The spelling of 25279340557 in words is "twenty-five billion, two hundred seventy-nine million, three hundred forty thousand, five hundred fifty-seven".