18943624081229 has 2 divisors, whose sum is σ = 18943624081230. Its totient is φ = 18943624081228.

The previous prime is 18943624081157. The next prime is 18943624081351. The reversal of 18943624081229 is 92218042634981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18818226648004 + 125397433225 = 4337998^2 + 354115^2 .

It is an emirp because it is prime and its reverse (92218042634981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18943624081229 is a prime.

It is a super-4 number, since 4×18943624081229⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18943624081829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9471812040614 + 9471812040615.

It is an arithmetic number, because the mean of its divisors is an integer number (9471812040615).

Almost surely, 2^{18943624081229} is an apocalyptic number.

It is an amenable number.

18943624081229 is a deficient number, since it is larger than the sum of its proper divisors (1).

18943624081229 is an equidigital number, since it uses as much as digits as its factorization.

18943624081229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11943936, while the sum is 59.

The spelling of 18943624081229 in words is "eighteen trillion, nine hundred forty-three billion, six hundred twenty-four million, eighty-one thousand, two hundred twenty-nine".