18945012793 has 4 divisors (see below), whose sum is σ = 21651443200. Its totient is φ = 16238582388.

The previous prime is 18945012773. The next prime is 18945012829. The reversal of 18945012793 is 39721054981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-18945012793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18945012743) 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, 1353215193 + ... + 1353215206.

It is an arithmetic number, because the mean of its divisors is an integer number (5412860800).

Almost surely, 2^18945012793 is an apocalyptic number.

It is an amenable number.

18945012793 is a deficient number, since it is larger than the sum of its proper divisors (2706430407).

18945012793 is an equidigital number, since it uses as much as digits as its factorization.

18945012793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2706430406.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 18945012793 in words is "eighteen billion, nine hundred forty-five million, twelve thousand, seven hundred ninety-three".