18195840001 has 4 divisors (see below), whose sum is σ = 18203458900. Its totient is φ = 18188221104.

The previous prime is 18195839951. The next prime is 18195840007. The reversal of 18195840001 is 10004859181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10004859181 = 653 ⋅15321377.

It can be written as a sum of positive squares in 2 ways, for example, as 2651735025 + 15544104976 = 51495^2 + 124676^2 .

It is a cyclic number.

It is not a de Polignac number, because 18195840001 - 2¹³ = 18195831809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18195840007) 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, 3805866 + ... + 3810643.

It is an arithmetic number, because the mean of its divisors is an integer number (4550864725).

Almost surely, 2^18195840001 is an apocalyptic number.

It is an amenable number.

18195840001 is a deficient number, since it is larger than the sum of its proper divisors (7618899).

18195840001 is an equidigital number, since it uses as much as digits as its factorization.

18195840001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7618898.

The product of its (nonzero) digits is 11520, while the sum is 37.

The spelling of 18195840001 in words is "eighteen billion, one hundred ninety-five million, eight hundred forty thousand, one".