25557052777 has 2 divisors, whose sum is σ = 25557052778. Its totient is φ = 25557052776.

The previous prime is 25557052757. The next prime is 25557052789. The reversal of 25557052777 is 77725075552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25286088256 + 270964521 = 159016^2 + 16461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25557052777 is a prime.

It is not a weakly prime, because it can be changed into another prime (25557052757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12778526388 + 12778526389.

It is an arithmetic number, because the mean of its divisors is an integer number (12778526389).

Almost surely, 2^25557052777 is an apocalyptic number.

It is an amenable number.

25557052777 is a deficient number, since it is larger than the sum of its proper divisors (1).

25557052777 is an equidigital number, since it uses as much as digits as its factorization.

25557052777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6002500, while the sum is 52.

The spelling of 25557052777 in words is "twenty-five billion, five hundred fifty-seven million, fifty-two thousand, seven hundred seventy-seven".