18454017397 has 4 divisors (see below), whose sum is σ = 18676355040. Its totient is φ = 18231679756.

The previous prime is 18454017391. The next prime is 18454017401. The reversal of 18454017397 is 79371045481.

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 not a de Polignac number, because 18454017397 - 2⁷ = 18454017269 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18454017397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18454017391) 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, 111168697 + ... + 111168862.

It is an arithmetic number, because the mean of its divisors is an integer number (4669088760).

Almost surely, 2^18454017397 is an apocalyptic number.

It is an amenable number.

18454017397 is a deficient number, since it is larger than the sum of its proper divisors (222337643).

18454017397 is an equidigital number, since it uses as much as digits as its factorization.

18454017397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222337642.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 18454017397 in words is "eighteen billion, four hundred fifty-four million, seventeen thousand, three hundred ninety-seven".