18535995749 has 2 divisors, whose sum is σ = 18535995750. Its totient is φ = 18535995748.

The previous prime is 18535995739. The next prime is 18535995787. The reversal of 18535995749 is 94759953581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17810770849 + 725224900 = 133457^2 + 26930^2 .

It is an emirp because it is prime and its reverse (94759953581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18535995749 - 2¹² = 18535991653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18535995739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9267997874 + 9267997875.

It is an arithmetic number, because the mean of its divisors is an integer number (9267997875).

Almost surely, 2^18535995749 is an apocalyptic number.

It is an amenable number.

18535995749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18535995749 is an equidigital number, since it uses as much as digits as its factorization.

18535995749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236000, while the sum is 65.

The spelling of 18535995749 in words is "eighteen billion, five hundred thirty-five million, nine hundred ninety-five thousand, seven hundred forty-nine".