18348366993 has 16 divisors (see below), whose sum is σ = 26720845056. Its totient is φ = 11106759440.

The previous prime is 18348366991. The next prime is 18348367033. The reversal of 18348366993 is 39966384381.

It is a cyclic number.

It is not a de Polignac number, because 18348366993 - 2¹ = 18348366991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18348366991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308871 + ... + 363452.

It is an arithmetic number, because the mean of its divisors is an integer number (1670052816).

Almost surely, 2^18348366993 is an apocalyptic number.

It is an amenable number.

18348366993 is a deficient number, since it is larger than the sum of its proper divisors (8372478063).

18348366993 is a wasteful number, since it uses less digits than its factorization.

18348366993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673164.

The product of its digits is 20155392, while the sum is 60.

The spelling of 18348366993 in words is "eighteen billion, three hundred forty-eight million, three hundred sixty-six thousand, nine hundred ninety-three".