18989750068 has 6 divisors (see below), whose sum is σ = 33232062626. Its totient is φ = 9494875032.

The previous prime is 18989750041. The next prime is 18989750069. The reversal of 18989750068 is 86005798981.

It can be written as a sum of positive squares in only one way, i.e., 16764552484 + 2225197584 = 129478^2 + 47172^2 .

It is a super-2 number, since 2×18989750068² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18989749988 and 18989750015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18989750069) by changing a digit.

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, 2373718755 + ... + 2373718762.

Almost surely, 2^18989750068 is an apocalyptic number.

It is an amenable number.

18989750068 is a deficient number, since it is larger than the sum of its proper divisors (14242312558).

18989750068 is a wasteful number, since it uses less digits than its factorization.

18989750068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4747437521 (or 4747437519 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 61.

The spelling of 18989750068 in words is "eighteen billion, nine hundred eighty-nine million, seven hundred fifty thousand, sixty-eight".