18043897719 has 16 divisors (see below), whose sum is σ = 24298476800. Its totient is φ = 11909353536.

The previous prime is 18043897681. The next prime is 18043897723. The reversal of 18043897719 is 91779834081.

It is not a de Polignac number, because 18043897719 - 2⁷ = 18043897591 is a prime.

It is a super-2 number, since 2×18043897719² (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 (18043890719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2226627 + ... + 2234715.

It is an arithmetic number, because the mean of its divisors is an integer number (1518654800).

Almost surely, 2^18043897719 is an apocalyptic number.

18043897719 is a deficient number, since it is larger than the sum of its proper divisors (6254579081).

18043897719 is a wasteful number, since it uses less digits than its factorization.

18043897719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15414.

The product of its (nonzero) digits is 3048192, while the sum is 57.

The spelling of 18043897719 in words is "eighteen billion, forty-three million, eight hundred ninety-seven thousand, seven hundred nineteen".