18989146666 has 32 divisors (see below), whose sum is σ = 33354668160. Its totient is φ = 7938254016.

The previous prime is 18989146663. The next prime is 18989146699. The reversal of 18989146666 is 66664198981.

It is a super-2 number, since 2×18989146666² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18989146598 and 18989146607.

It is not an unprimeable number, because it can be changed into a prime (18989146663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 434880 + ... + 476548.

It is an arithmetic number, because the mean of its divisors is an integer number (1042333380).

Almost surely, 2^18989146666 is an apocalyptic number.

18989146666 is a deficient number, since it is larger than the sum of its proper divisors (14365521494).

18989146666 is a wasteful number, since it uses less digits than its factorization.

18989146666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42478.

The product of its digits is 26873856, while the sum is 64.

The spelling of 18989146666 in words is "eighteen billion, nine hundred eighty-nine million, one hundred forty-six thousand, six hundred sixty-six".