18339951853 has 4 divisors (see below), whose sum is σ = 19137341088. Its totient is φ = 17542562620.

The previous prime is 18339951811. The next prime is 18339951863. The reversal of 18339951853 is 35815993381.

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 cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18339951853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18339951794 and 18339951803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18339951863) 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, 398694583 + ... + 398694628.

It is an arithmetic number, because the mean of its divisors is an integer number (4784335272).

Almost surely, 2^18339951853 is an apocalyptic number.

It is an amenable number.

18339951853 is a deficient number, since it is larger than the sum of its proper divisors (797389235).

18339951853 is an equidigital number, since it uses as much as digits as its factorization.

18339951853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797389234.

The product of its digits is 3499200, while the sum is 55.

The spelling of 18339951853 in words is "eighteen billion, three hundred thirty-nine million, nine hundred fifty-one thousand, eight hundred fifty-three".