27866386939 has 2 divisors, whose sum is σ = 27866386940. Its totient is φ = 27866386938.

The previous prime is 27866386931. The next prime is 27866386957. The reversal of 27866386939 is 93968366872.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27866386939 - 2³ = 27866386931 is a prime.

It is not a weakly prime, because it can be changed into another prime (27866386931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13933193469 + 13933193470.

It is an arithmetic number, because the mean of its divisors is an integer number (13933193470).

Almost surely, 2^27866386939 is an apocalyptic number.

27866386939 is a deficient number, since it is larger than the sum of its proper divisors (1).

27866386939 is an equidigital number, since it uses as much as digits as its factorization.

27866386939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141087744, while the sum is 67.

The spelling of 27866386939 in words is "twenty-seven billion, eight hundred sixty-six million, three hundred eighty-six thousand, nine hundred thirty-nine".