27755813257 has 2 divisors, whose sum is σ = 27755813258. Its totient is φ = 27755813256.

The previous prime is 27755813251. The next prime is 27755813279. The reversal of 27755813257 is 75231855772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25515589696 + 2240223561 = 159736^2 + 47331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27755813257 is a prime.

It is not a weakly prime, because it can be changed into another prime (27755813251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13877906628 + 13877906629.

It is an arithmetic number, because the mean of its divisors is an integer number (13877906629).

Almost surely, 2^27755813257 is an apocalyptic number.

It is an amenable number.

27755813257 is a deficient number, since it is larger than the sum of its proper divisors (1).

27755813257 is an equidigital number, since it uses as much as digits as its factorization.

27755813257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4116000, while the sum is 52.

The spelling of 27755813257 in words is "twenty-seven billion, seven hundred fifty-five million, eight hundred thirteen thousand, two hundred fifty-seven".