18856022369 has 2 divisors, whose sum is σ = 18856022370. Its totient is φ = 18856022368.

The previous prime is 18856022363. The next prime is 18856022387. The reversal of 18856022369 is 96322065881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12990300625 + 5865721744 = 113975^2 + 76588^2 .

It is an emirp because it is prime and its reverse (96322065881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18856022369 - 2¹² = 18856018273 is a prime.

It is a super-2 number, since 2×18856022369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18856022363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9428011184 + 9428011185.

It is an arithmetic number, because the mean of its divisors is an integer number (9428011185).

Almost surely, 2^18856022369 is an apocalyptic number.

It is an amenable number.

18856022369 is a deficient number, since it is larger than the sum of its proper divisors (1).

18856022369 is an equidigital number, since it uses as much as digits as its factorization.

18856022369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 18856022369 in words is "eighteen billion, eight hundred fifty-six million, twenty-two thousand, three hundred sixty-nine".