19668066 has 24 divisors (see below), whose sum is σ = 43238832. Its totient is φ = 5959800.

The previous prime is 19668049. The next prime is 19668079. The reversal of 19668066 is 66086691.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12820 + ... + 14271.

It is an arithmetic number, because the mean of its divisors is an integer number (1801618).

Almost surely, 2^19668066 is an apocalyptic number.

19668066 is an abundant number, since it is smaller than the sum of its proper divisors (23570766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19668066 is a wasteful number, since it uses less digits than its factorization.

19668066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27118 (or 27107 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 19668066 is about 4434.8693329116. The cubic root of 19668066 is about 269.9316974004.

The spelling of 19668066 in words is "nineteen million, six hundred sixty-eight thousand, sixty-six".