18519141749 has 4 divisors (see below), whose sum is σ = 19493833440. Its totient is φ = 17544450060.

The previous prime is 18519141733. The next prime is 18519141803. The reversal of 18519141749 is 94714191581.

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: 94714191581 = 81509 ⋅1162009.

It is a cyclic number.

It is not a de Polignac number, because 18519141749 - 2⁴ = 18519141733 is a prime.

It is a super-2 number, since 2×18519141749² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18519141697 and 18519141706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18519141049) 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, 487345817 + ... + 487345854.

It is an arithmetic number, because the mean of its divisors is an integer number (4873458360).

Almost surely, 2^18519141749 is an apocalyptic number.

18519141749 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18519141749 is a deficient number, since it is larger than the sum of its proper divisors (974691691).

18519141749 is an equidigital number, since it uses as much as digits as its factorization.

18519141749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974691690.

The product of its digits is 362880, while the sum is 50.

The spelling of 18519141749 in words is "eighteen billion, five hundred nineteen million, one hundred forty-one thousand, seven hundred forty-nine".