18943624064773 has 2 divisors, whose sum is σ = 18943624064774. Its totient is φ = 18943624064772.

The previous prime is 18943624064759. The next prime is 18943624064789. The reversal of 18943624064773 is 37746042634981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18078160392964 + 865463671809 = 4251842^2 + 930303^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18943624064773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18943624061773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9471812032386 + 9471812032387.

It is an arithmetic number, because the mean of its divisors is an integer number (9471812032387).

Almost surely, 2^{18943624064773} is an apocalyptic number.

It is an amenable number.

18943624064773 is a deficient number, since it is larger than the sum of its proper divisors (1).

18943624064773 is an equidigital number, since it uses as much as digits as its factorization.

18943624064773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 146313216, while the sum is 64.

The spelling of 18943624064773 in words is "eighteen trillion, nine hundred forty-three billion, six hundred twenty-four million, sixty-four thousand, seven hundred seventy-three".