25477078717 has 2 divisors, whose sum is σ = 25477078718. Its totient is φ = 25477078716.

The previous prime is 25477078639. The next prime is 25477078733. The reversal of 25477078717 is 71787077452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25310900836 + 166177881 = 159094^2 + 12891^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25477078717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25477078787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12738539358 + 12738539359.

It is an arithmetic number, because the mean of its divisors is an integer number (12738539359).

Almost surely, 2^25477078717 is an apocalyptic number.

It is an amenable number.

25477078717 is a deficient number, since it is larger than the sum of its proper divisors (1).

25477078717 is an equidigital number, since it uses as much as digits as its factorization.

25477078717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5378240, while the sum is 55.

The spelling of 25477078717 in words is "twenty-five billion, four hundred seventy-seven million, seventy-eight thousand, seven hundred seventeen".