18738929663 has 4 divisors (see below), whose sum is σ = 18746608848. Its totient is φ = 18731250480.

The previous prime is 18738929653. The next prime is 18738929689. The reversal of 18738929663 is 36692983781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36692983781 = 1163 ⋅31550287.

It is a cyclic number.

It is not a de Polignac number, because 18738929663 - 2⁴ = 18738929647 is a prime.

It is a super-2 number, since 2×18738929663² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18738929596 and 18738929605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18738929653) 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, 3835931 + ... + 3840812.

It is an arithmetic number, because the mean of its divisors is an integer number (4686652212).

Almost surely, 2^18738929663 is an apocalyptic number.

18738929663 is a deficient number, since it is larger than the sum of its proper divisors (7679185).

18738929663 is an equidigital number, since it uses as much as digits as its factorization.

18738929663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7679184.

The product of its digits is 23514624, while the sum is 62.

The spelling of 18738929663 in words is "eighteen billion, seven hundred thirty-eight million, nine hundred twenty-nine thousand, six hundred sixty-three".