18723293709 has 8 divisors (see below), whose sum is σ = 26278307040. Its totient is φ = 11825238096.

The previous prime is 18723293707. The next prime is 18723293711. The reversal of 18723293709 is 90739232781.

It is an interprime number because it is at equal distance from previous prime (18723293707) and next prime (18723293711).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18723293709 - 2¹ = 18723293707 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18723293707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164239362 + ... + 164239475.

It is an arithmetic number, because the mean of its divisors is an integer number (3284788380).

Almost surely, 2^18723293709 is an apocalyptic number.

18723293709 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18723293709 is a deficient number, since it is larger than the sum of its proper divisors (7555013331).

18723293709 is a wasteful number, since it uses less digits than its factorization.

18723293709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328478859.

The product of its (nonzero) digits is 1143072, while the sum is 51.

The spelling of 18723293709 in words is "eighteen billion, seven hundred twenty-three million, two hundred ninety-three thousand, seven hundred nine".