18856022387 has 2 divisors, whose sum is σ = 18856022388. Its totient is φ = 18856022386.

The previous prime is 18856022369. The next prime is 18856022417. The reversal of 18856022387 is 78322065881.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (78322065881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18856022387 - 2²⁰ = 18854973811 is a prime.

It is not a weakly prime, because it can be changed into another prime (18856022347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9428011193 + 9428011194.

It is an arithmetic number, because the mean of its divisors is an integer number (9428011194).

Almost surely, 2^18856022387 is an apocalyptic number.

18856022387 is a deficient number, since it is larger than the sum of its proper divisors (1).

18856022387 is an equidigital number, since it uses as much as digits as its factorization.

18856022387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1290240, while the sum is 50.

The spelling of 18856022387 in words is "eighteen billion, eight hundred fifty-six million, twenty-two thousand, three hundred eighty-seven".