27975618257 has 2 divisors, whose sum is σ = 27975618258. Its totient is φ = 27975618256.

The previous prime is 27975618233. The next prime is 27975618277. The reversal of 27975618257 is 75281657972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19098963601 + 8876654656 = 138199^2 + 94216^2 .

It is a cyclic number.

It is not a de Polignac number, because 27975618257 - 2²⁰ = 27974569681 is a prime.

It is a super-2 number, since 2×27975618257² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27975618196 and 27975618205.

It is not a weakly prime, because it can be changed into another prime (27975618227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13987809128 + 13987809129.

It is an arithmetic number, because the mean of its divisors is an integer number (13987809129).

Almost surely, 2^27975618257 is an apocalyptic number.

It is an amenable number.

27975618257 is a deficient number, since it is larger than the sum of its proper divisors (1).

27975618257 is an equidigital number, since it uses as much as digits as its factorization.

27975618257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14817600, while the sum is 59.

The spelling of 27975618257 in words is "twenty-seven billion, nine hundred seventy-five million, six hundred eighteen thousand, two hundred fifty-seven".