18905666341 has 4 divisors (see below), whose sum is σ = 19557585900. Its totient is φ = 18253746784.

The previous prime is 18905666321. The next prime is 18905666347. The reversal of 18905666341 is 14366650981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14366650981 = 59 ⋅243502559.

It can be written as a sum of positive squares in 2 ways, for example, as 14239410241 + 4666256100 = 119329^2 + 68310^2 .

It is a cyclic number.

It is not a de Polignac number, because 18905666341 - 2⁵ = 18905666309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18905666347) 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, 325959736 + ... + 325959793.

It is an arithmetic number, because the mean of its divisors is an integer number (4889396475).

Almost surely, 2^18905666341 is an apocalyptic number.

It is an amenable number.

18905666341 is a deficient number, since it is larger than the sum of its proper divisors (651919559).

18905666341 is an equidigital number, since it uses as much as digits as its factorization.

18905666341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651919558.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 18905666341 in words is "eighteen billion, nine hundred five million, six hundred sixty-six thousand, three hundred forty-one".