66019868 has 12 divisors (see below), whose sum is σ = 115615752. Its totient is φ = 32986800.

The previous prime is 66019861. The next prime is 66019871. The reversal of 66019868 is 86891066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66019861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1718 + ... + 11618.

It is an arithmetic number, because the mean of its divisors is an integer number (9634646).

Almost surely, 2^66019868 is an apocalyptic number.

It is an amenable number.

66019868 is a deficient number, since it is larger than the sum of its proper divisors (49595884).

66019868 is a wasteful number, since it uses less digits than its factorization.

66019868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11572 (or 11570 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 66019868 is about 8125.2611034969. The cubic root of 66019868 is about 404.1645491841.

The spelling of 66019868 in words is "sixty-six million, nineteen thousand, eight hundred sixty-eight".