18420901441 has 4 divisors (see below), whose sum is σ = 18443122900. Its totient is φ = 18398679984.

The previous prime is 18420901423. The next prime is 18420901453. The reversal of 18420901441 is 14410902481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14410902481 = 43 ⋅335137267.

It can be written as a sum of positive squares in 2 ways, for example, as 10136261041 + 8284640400 = 100679^2 + 91020^2 .

It is a cyclic number.

It is not a de Polignac number, because 18420901441 - 2⁹ = 18420900929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18420901397 and 18420901406.

It is not an unprimeable number, because it can be changed into a prime (18420901481) 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, 11109486 + ... + 11111143.

It is an arithmetic number, because the mean of its divisors is an integer number (4610780725).

Almost surely, 2^18420901441 is an apocalyptic number.

It is an amenable number.

18420901441 is a deficient number, since it is larger than the sum of its proper divisors (22221459).

18420901441 is an equidigital number, since it uses as much as digits as its factorization.

18420901441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22221458.

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 18420901441 in words is "eighteen billion, four hundred twenty million, nine hundred one thousand, four hundred forty-one".