18722745593 has 8 divisors (see below), whose sum is σ = 19378603080. Its totient is φ = 18067571200.

The previous prime is 18722745563. The next prime is 18722745623. The reversal of 18722745593 is 39554722781.

It is an interprime number because it is at equal distance from previous prime (18722745563) and next prime (18722745623).

It can be written as a sum of positive squares in 4 ways, for example, as 630612544 + 18092133049 = 25112^2 + 134507^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18722745593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18722745563) 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, 114680 + ... + 224937.

It is an arithmetic number, because the mean of its divisors is an integer number (2422325385).

Almost surely, 2^18722745593 is an apocalyptic number.

It is an amenable number.

18722745593 is a deficient number, since it is larger than the sum of its proper divisors (655857487).

18722745593 is a wasteful number, since it uses less digits than its factorization.

18722745593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341547.

The product of its digits is 4233600, while the sum is 53.

The spelling of 18722745593 in words is "eighteen billion, seven hundred twenty-two million, seven hundred forty-five thousand, five hundred ninety-three".