66493816 has 16 divisors (see below), whose sum is σ = 124795800. Its totient is φ = 33214944.

The previous prime is 66493811. The next prime is 66493831. The reversal of 66493816 is 61839466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66493811) 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 in 3 ways as a sum of consecutive naturals, for example, 6451 + ... + 13213.

Almost surely, 2^66493816 is an apocalyptic number.

It is an amenable number.

66493816 is a deficient number, since it is larger than the sum of its proper divisors (58301984).

66493816 is a wasteful number, since it uses less digits than its factorization.

66493816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7998 (or 7994 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The square root of 66493816 is about 8154.3740409672. The cubic root of 66493816 is about 405.1293921778.

The spelling of 66493816 in words is "sixty-six million, four hundred ninety-three thousand, eight hundred sixteen".