27750646657 has 2 divisors, whose sum is σ = 27750646658. Its totient is φ = 27750646656.

The previous prime is 27750646633. The next prime is 27750646673. The reversal of 27750646657 is 75664605772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27707599936 + 43046721 = 166456^2 + 6561^2 .

It is a cyclic number.

It is not a de Polignac number, because 27750646657 - 2⁷ = 27750646529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27750646598 and 27750646607.

It is not a weakly prime, because it can be changed into another prime (27750646687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13875323328 + 13875323329.

It is an arithmetic number, because the mean of its divisors is an integer number (13875323329).

Almost surely, 2^27750646657 is an apocalyptic number.

It is an amenable number.

27750646657 is a deficient number, since it is larger than the sum of its proper divisors (1).

27750646657 is an equidigital number, since it uses as much as digits as its factorization.

27750646657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14817600, while the sum is 55.

The spelling of 27750646657 in words is "twenty-seven billion, seven hundred fifty million, six hundred forty-six thousand, six hundred fifty-seven".