18641843401 has 4 divisors (see below), whose sum is σ = 18644528404. Its totient is φ = 18639158400.

The previous prime is 18641843383. The next prime is 18641843411. The reversal of 18641843401 is 10434814681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10434814681 = 853 ⋅12233077.

It can be written as a sum of positive squares in 2 ways, for example, as 11864437776 + 6777405625 = 108924^2 + 82325^2 .

It is a cyclic number.

It is not a de Polignac number, because 18641843401 - 2¹⁹ = 18641319113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18641843411) 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, 1332060 + ... + 1345981.

It is an arithmetic number, because the mean of its divisors is an integer number (4661132101).

Almost surely, 2^18641843401 is an apocalyptic number.

It is an amenable number.

18641843401 is a deficient number, since it is larger than the sum of its proper divisors (2685003).

18641843401 is an equidigital number, since it uses as much as digits as its factorization.

18641843401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2685002.

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 18641843401 in words is "eighteen billion, six hundred forty-one million, eight hundred forty-three thousand, four hundred one".