27857115989 has 2 divisors, whose sum is σ = 27857115990. Its totient is φ = 27857115988.

The previous prime is 27857115971. The next prime is 27857115991. The reversal of 27857115989 is 98951175872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19548793489 + 8308322500 = 139817^2 + 91150^2 .

It is a cyclic number.

It is not a de Polignac number, because 27857115989 - 2³² = 23562148693 is a prime.

It is a super-2 number, since 2×27857115989² (a number of 22 digits) contains 22 as substring.

Together with 27857115991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27857115289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13928557994 + 13928557995.

It is an arithmetic number, because the mean of its divisors is an integer number (13928557995).

Almost surely, 2^27857115989 is an apocalyptic number.

It is an amenable number.

27857115989 is a deficient number, since it is larger than the sum of its proper divisors (1).

27857115989 is an equidigital number, since it uses as much as digits as its factorization.

27857115989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12700800, while the sum is 62.

The spelling of 27857115989 in words is "twenty-seven billion, eight hundred fifty-seven million, one hundred fifteen thousand, nine hundred eighty-nine".