18022893749 has 4 divisors (see below), whose sum is σ = 20597592864. Its totient is φ = 15448194636.

The previous prime is 18022893743. The next prime is 18022893751. The reversal of 18022893749 is 94739822081.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94739822081 = 677 ⋅139940653.

It is a de Polignac number, because none of the positive numbers 2^k-18022893749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18022893749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18022893743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1287349547 + ... + 1287349560.

It is an arithmetic number, because the mean of its divisors is an integer number (5149398216).

Almost surely, 2^18022893749 is an apocalyptic number.

It is an amenable number.

18022893749 is a deficient number, since it is larger than the sum of its proper divisors (2574699115).

18022893749 is an equidigital number, since it uses as much as digits as its factorization.

18022893749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574699114.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The spelling of 18022893749 in words is "eighteen billion, twenty-two million, eight hundred ninety-three thousand, seven hundred forty-nine".