18770441993 has 2 divisors, whose sum is σ = 18770441994. Its totient is φ = 18770441992.

The previous prime is 18770441983. The next prime is 18770442059. The reversal of 18770441993 is 39914407781.

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., 18743526649 + 26915344 = 136907^2 + 5188^2 .

It is a cyclic number.

It is not a de Polignac number, because 18770441993 - 2¹² = 18770437897 is a prime.

It is a super-2 number, since 2×18770441993² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18770441983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9385220996 + 9385220997.

It is an arithmetic number, because the mean of its divisors is an integer number (9385220997).

Almost surely, 2^18770441993 is an apocalyptic number.

It is an amenable number.

18770441993 is a deficient number, since it is larger than the sum of its proper divisors (1).

18770441993 is an equidigital number, since it uses as much as digits as its factorization.

18770441993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 53.

The spelling of 18770441993 in words is "eighteen billion, seven hundred seventy million, four hundred forty-one thousand, nine hundred ninety-three".