18213965749 has 8 divisors (see below), whose sum is σ = 20889517760. Its totient is φ = 15556802976.

The previous prime is 18213965741. The next prime is 18213965827. The reversal of 18213965749 is 94756931281.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18213965749 - 2³ = 18213965741 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 18213965749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18213965741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4595184 + ... + 4599145.

It is an arithmetic number, because the mean of its divisors is an integer number (2611189720).

Almost surely, 2^18213965749 is an apocalyptic number.

It is an amenable number.

18213965749 is a deficient number, since it is larger than the sum of its proper divisors (2675552011).

18213965749 is an equidigital number, since it uses as much as digits as its factorization.

18213965749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9194619.

The product of its digits is 3265920, while the sum is 55.

The spelling of 18213965749 in words is "eighteen billion, two hundred thirteen million, nine hundred sixty-five thousand, seven hundred forty-nine".