25277091857 has 2 divisors, whose sum is σ = 25277091858. Its totient is φ = 25277091856.

The previous prime is 25277091799. The next prime is 25277091871. The reversal of 25277091857 is 75819077252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20804023696 + 4473068161 = 144236^2 + 66881^2 .

It is a cyclic number.

It is not a de Polignac number, because 25277091857 - 2⁸ = 25277091601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25277091799 and 25277091808.

It is not a weakly prime, because it can be changed into another prime (25277091757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12638545928 + 12638545929.

It is an arithmetic number, because the mean of its divisors is an integer number (12638545929).

Almost surely, 2^25277091857 is an apocalyptic number.

It is an amenable number.

25277091857 is a deficient number, since it is larger than the sum of its proper divisors (1).

25277091857 is an equidigital number, since it uses as much as digits as its factorization.

25277091857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2469600, while the sum is 53.

The spelling of 25277091857 in words is "twenty-five billion, two hundred seventy-seven million, ninety-one thousand, eight hundred fifty-seven".