18417241897 has 4 divisors (see below), whose sum is σ = 18419369220. Its totient is φ = 18415114576.

The previous prime is 18417241889. The next prime is 18417241919. The reversal of 18417241897 is 79814271481.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9699098256 + 8718143641 = 98484^2 + 93371^2 .

It is a cyclic number.

It is not a de Polignac number, because 18417241897 - 2³ = 18417241889 is a prime.

It is a super-2 number, since 2×18417241897² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18417241847) 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, 1050622 + ... + 1068007.

It is an arithmetic number, because the mean of its divisors is an integer number (4604842305).

Almost surely, 2^18417241897 is an apocalyptic number.

It is an amenable number.

18417241897 is a deficient number, since it is larger than the sum of its proper divisors (2127323).

18417241897 is an equidigital number, since it uses as much as digits as its factorization.

18417241897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127322.

The product of its digits is 903168, while the sum is 52.

The spelling of 18417241897 in words is "eighteen billion, four hundred seventeen million, two hundred forty-one thousand, eight hundred ninety-seven".