18943624064789 has 2 divisors, whose sum is σ = 18943624064790. Its totient is φ = 18943624064788.

The previous prime is 18943624064773. The next prime is 18943624064809. The reversal of 18943624064789 is 98746042634981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18724054036900 + 219570027889 = 4327130^2 + 468583^2 .

It is a cyclic number.

It is not a de Polignac number, because 18943624064789 - 2⁴ = 18943624064773 is a prime.

It is a super-2 number, since 2×18943624064789² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18943624064759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9471812032394 + 9471812032395.

It is an arithmetic number, because the mean of its divisors is an integer number (9471812032395).

Almost surely, 2^{18943624064789} is an apocalyptic number.

It is an amenable number.

18943624064789 is a deficient number, since it is larger than the sum of its proper divisors (1).

18943624064789 is an equidigital number, since it uses as much as digits as its factorization.

18943624064789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 501645312, while the sum is 71.

The spelling of 18943624064789 in words is "eighteen trillion, nine hundred forty-three billion, six hundred twenty-four million, sixty-four thousand, seven hundred eighty-nine".