25870780777 has 2 divisors, whose sum is σ = 25870780778. Its totient is φ = 25870780776.

The previous prime is 25870780759. The next prime is 25870780813. The reversal of 25870780777 is 77708707852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21537323536 + 4333457241 = 146756^2 + 65829^2 .

It is a cyclic number.

It is not a de Polignac number, because 25870780777 - 2²⁷ = 25736563049 is a prime.

It is not a weakly prime, because it can be changed into another prime (25870780717) 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, 12935390388 + 12935390389.

It is an arithmetic number, because the mean of its divisors is an integer number (12935390389).

Almost surely, 2^25870780777 is an apocalyptic number.

It is an amenable number.

25870780777 is a deficient number, since it is larger than the sum of its proper divisors (1).

25870780777 is an equidigital number, since it uses as much as digits as its factorization.

25870780777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10756480, while the sum is 58.

The spelling of 25870780777 in words is "twenty-five billion, eight hundred seventy million, seven hundred eighty thousand, seven hundred seventy-seven".