18946530385 has 4 divisors (see below), whose sum is σ = 22735836468. Its totient is φ = 15157224304.

The previous prime is 18946530367. The next prime is 18946530389. The reversal of 18946530385 is 58303564981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58303564981 = 189823 ⋅307147.

It can be written as a sum of positive squares in 2 ways, for example, as 5371717264 + 13574813121 = 73292^2 + 116511^2 .

It is a cyclic number.

It is not a de Polignac number, because 18946530385 - 2⁵ = 18946530353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18946530389) 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, 1894653034 + ... + 1894653043.

It is an arithmetic number, because the mean of its divisors is an integer number (5683959117).

Almost surely, 2^18946530385 is an apocalyptic number.

It is an amenable number.

18946530385 is a deficient number, since it is larger than the sum of its proper divisors (3789306083).

18946530385 is an equidigital number, since it uses as much as digits as its factorization.

18946530385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3789306082.

The product of its (nonzero) digits is 3110400, while the sum is 52.

The spelling of 18946530385 in words is "eighteen billion, nine hundred forty-six million, five hundred thirty thousand, three hundred eighty-five".