18970814773 has 2 divisors, whose sum is σ = 18970814774. Its totient is φ = 18970814772.

The previous prime is 18970814771. The next prime is 18970814789. The reversal of 18970814773 is 37741807981.

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., 13797321444 + 5173493329 = 117462^2 + 71927^2 .

It is an emirp because it is prime and its reverse (37741807981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18970814773 - 2¹ = 18970814771 is a prime.

Together with 18970814771, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18970814771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9485407386 + 9485407387.

It is an arithmetic number, because the mean of its divisors is an integer number (9485407387).

Almost surely, 2^18970814773 is an apocalyptic number.

It is an amenable number.

18970814773 is a deficient number, since it is larger than the sum of its proper divisors (1).

18970814773 is an equidigital number, since it uses as much as digits as its factorization.

18970814773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2370816, while the sum is 55.

The spelling of 18970814773 in words is "eighteen billion, nine hundred seventy million, eight hundred fourteen thousand, seven hundred seventy-three".