18340783519 has 4 divisors (see below), whose sum is σ = 18973224360. Its totient is φ = 17708342680.

The previous prime is 18340783471. The next prime is 18340783541. The reversal of 18340783519 is 91538704381.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18340783519 - 2²³ = 18332394911 is a prime.

It is a super-2 number, since 2×18340783519² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18340781519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316220377 + ... + 316220434.

It is an arithmetic number, because the mean of its divisors is an integer number (4743306090).

Almost surely, 2^18340783519 is an apocalyptic number.

18340783519 is a deficient number, since it is larger than the sum of its proper divisors (632440841).

18340783519 is an equidigital number, since it uses as much as digits as its factorization.

18340783519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632440840.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 18340783519 in words is "eighteen billion, three hundred forty million, seven hundred eighty-three thousand, five hundred nineteen".