18664943434 has 8 divisors (see below), whose sum is σ = 27998198820. Its totient is φ = 9332210496.

The previous prime is 18664943389. The next prime is 18664943449. The reversal of 18664943434 is 43434946681.

It can be written as a sum of positive squares in 2 ways, for example, as 16371970209 + 2292973225 = 127953^2 + 47885^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18664943434² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23839 + ... + 194674.

Almost surely, 2^18664943434 is an apocalyptic number.

18664943434 is a deficient number, since it is larger than the sum of its proper divisors (9333255386).

18664943434 is a wasteful number, since it uses less digits than its factorization.

18664943434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261224.

The product of its digits is 5971968, while the sum is 52.

The spelling of 18664943434 in words is "eighteen billion, six hundred sixty-four million, nine hundred forty-three thousand, four hundred thirty-four".