18738929665 has 16 divisors (see below), whose sum is σ = 23082595200. Its totient is φ = 14595396480.

The previous prime is 18738929653. The next prime is 18738929689. The reversal of 18738929665 is 56692983781.

It is not a de Polignac number, because 18738929665 - 2¹¹ = 18738927617 is a prime.

It is a super-2 number, since 2×18738929665² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18738929597 and 18738929606.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5986 + ... + 193684.

It is an arithmetic number, because the mean of its divisors is an integer number (1442662200).

Almost surely, 2^18738929665 is an apocalyptic number.

It is an amenable number.

18738929665 is a deficient number, since it is larger than the sum of its proper divisors (4343665535).

18738929665 is a wasteful number, since it uses less digits than its factorization.

18738929665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188232.

The product of its digits is 39191040, while the sum is 64.

The spelling of 18738929665 in words is "eighteen billion, seven hundred thirty-eight million, nine hundred twenty-nine thousand, six hundred sixty-five".