18945732793 has 4 divisors (see below), whose sum is σ = 20403096868. Its totient is φ = 17488368720.

The previous prime is 18945732769. The next prime is 18945732829. The reversal of 18945732793 is 39723754981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7581533184 + 11364199609 = 87072^2 + 106603^2 .

It is a cyclic number.

It is not a de Polignac number, because 18945732793 - 2²⁵ = 18912178361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18945732703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 728682018 + ... + 728682043.

It is an arithmetic number, because the mean of its divisors is an integer number (5100774217).

Almost surely, 2^18945732793 is an apocalyptic number.

18945732793 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18945732793 is a deficient number, since it is larger than the sum of its proper divisors (1457364075).

18945732793 is a wasteful number, since it uses less digits than its factorization.

18945732793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457364074.

The product of its digits is 11430720, while the sum is 58.

The spelling of 18945732793 in words is "eighteen billion, nine hundred forty-five million, seven hundred thirty-two thousand, seven hundred ninety-three".