25787678773 has 2 divisors, whose sum is σ = 25787678774. Its totient is φ = 25787678772.

The previous prime is 25787678747. The next prime is 25787678783. The reversal of 25787678773 is 37787678752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25388598244 + 399080529 = 159338^2 + 19977^2 .

It is a cyclic number.

It is not a de Polignac number, because 25787678773 - 2⁹ = 25787678261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25787678699 and 25787678708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25787678723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12893839386 + 12893839387.

It is an arithmetic number, because the mean of its divisors is an integer number (12893839387).

Almost surely, 2^25787678773 is an apocalyptic number.

It is an amenable number.

25787678773 is a deficient number, since it is larger than the sum of its proper divisors (1).

25787678773 is an equidigital number, since it uses as much as digits as its factorization.

25787678773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193616640, while the sum is 67.

The spelling of 25787678773 in words is "twenty-five billion, seven hundred eighty-seven million, six hundred seventy-eight thousand, seven hundred seventy-three".