18764119917 has 6 divisors (see below), whose sum is σ = 27103728782. Its totient is φ = 12509413272.

The previous prime is 18764119889. The next prime is 18764119931. The reversal of 18764119917 is 71991146781.

It can be written as a sum of positive squares in only one way, i.e., 18012592521 + 751527396 = 134211^2 + 27414^2 .

It is not a de Polignac number, because 18764119917 - 2³⁰ = 17690378093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18764019917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1042451098 + ... + 1042451115.

Almost surely, 2^18764119917 is an apocalyptic number.

It is an amenable number.

18764119917 is a deficient number, since it is larger than the sum of its proper divisors (8339608865).

18764119917 is a wasteful number, since it uses less digits than its factorization.

18764119917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2084902219 (or 2084902216 counting only the distinct ones).

The product of its digits is 762048, while the sum is 54.

The spelling of 18764119917 in words is "eighteen billion, seven hundred sixty-four million, one hundred nineteen thousand, nine hundred seventeen".