27918820847 has 2 divisors, whose sum is σ = 27918820848. Its totient is φ = 27918820846.

The previous prime is 27918820819. The next prime is 27918820901. The reversal of 27918820847 is 74802881972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27918820847 - 2²⁸ = 27650385391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27918820792 and 27918820801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27918820817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13959410423 + 13959410424.

It is an arithmetic number, because the mean of its divisors is an integer number (13959410424).

Almost surely, 2^27918820847 is an apocalyptic number.

27918820847 is a deficient number, since it is larger than the sum of its proper divisors (1).

27918820847 is an equidigital number, since it uses as much as digits as its factorization.

27918820847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3612672, while the sum is 56.

The spelling of 27918820847 in words is "twenty-seven billion, nine hundred eighteen million, eight hundred twenty thousand, eight hundred forty-seven".