18451951343 has 4 divisors (see below), whose sum is σ = 21087944400. Its totient is φ = 15815958288.

The previous prime is 18451951261. The next prime is 18451951363. The reversal of 18451951343 is 34315915481.

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 18451951343 - 2¹⁴ = 18451934959 is a prime.

It is a super-4 number, since 4×18451951343⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18451951294 and 18451951303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18451951363) 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, 1317996518 + ... + 1317996531.

It is an arithmetic number, because the mean of its divisors is an integer number (5271986100).

Almost surely, 2^18451951343 is an apocalyptic number.

18451951343 is a deficient number, since it is larger than the sum of its proper divisors (2635993057).

18451951343 is an equidigital number, since it uses as much as digits as its factorization.

18451951343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2635993056.

The product of its digits is 259200, while the sum is 44.

The spelling of 18451951343 in words is "eighteen billion, four hundred fifty-one million, nine hundred fifty-one thousand, three hundred forty-three".