18693687268 has 6 divisors (see below), whose sum is σ = 32713952726. Its totient is φ = 9346843632.

The previous prime is 18693687223. The next prime is 18693687283. The reversal of 18693687268 is 86278639681.

It can be written as a sum of positive squares in only one way, i.e., 16981217344 + 1712469924 = 130312^2 + 41382^2 .

It is a super-4 number, since 4×18693687268⁴ (a number of 42 digits) contains 4444 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2336710905 + ... + 2336710912.

Almost surely, 2^18693687268 is an apocalyptic number.

It is an amenable number.

18693687268 is a deficient number, since it is larger than the sum of its proper divisors (14020265458).

18693687268 is a wasteful number, since it uses less digits than its factorization.

18693687268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4673421821 (or 4673421819 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 64.

The spelling of 18693687268 in words is "eighteen billion, six hundred ninety-three million, six hundred eighty-seven thousand, two hundred sixty-eight".