18964065393 has 24 divisors (see below), whose sum is σ = 33713895488. Its totient is φ = 10003023072.

The previous prime is 18964065353. The next prime is 18964065397. The reversal of 18964065393 is 39356046981.

18964065393 is a `hidden beast` number, since 18 + 96 + 4 + 0 + 6 + 539 + 3 = 666.

It is not a de Polignac number, because 18964065393 - 2¹⁷ = 18963934321 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18964065397) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11576755 + ... + 11578392.

Almost surely, 2^18964065393 is an apocalyptic number.

18964065393 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18964065393 is a deficient number, since it is larger than the sum of its proper divisors (14749830095).

18964065393 is a wasteful number, since it uses less digits than its factorization.

18964065393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23155173 (or 23155170 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 18964065393 in words is "eighteen billion, nine hundred sixty-four million, sixty-five thousand, three hundred ninety-three".