27866359819 has 2 divisors, whose sum is σ = 27866359820. Its totient is φ = 27866359818.

The previous prime is 27866359817. The next prime is 27866359837. The reversal of 27866359819 is 91895366872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27866359819 - 2¹ = 27866359817 is a prime.

It is a super-2 number, since 2×27866359819² (a number of 22 digits) contains 22 as substring.

Together with 27866359817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (27866359817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13933179909 + 13933179910.

It is an arithmetic number, because the mean of its divisors is an integer number (13933179910).

Almost surely, 2^27866359819 is an apocalyptic number.

27866359819 is a deficient number, since it is larger than the sum of its proper divisors (1).

27866359819 is an equidigital number, since it uses as much as digits as its factorization.

27866359819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39191040, while the sum is 64.

The spelling of 27866359819 in words is "twenty-seven billion, eight hundred sixty-six million, three hundred fifty-nine thousand, eight hundred nineteen".