66351664 has 10 divisors (see below), whose sum is σ = 128556380. Its totient is φ = 33175824.

The previous prime is 66351569. The next prime is 66351683. The reversal of 66351664 is 46615366.

66351664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2073474 + ... + 2073505.

It is an arithmetic number, because the mean of its divisors is an integer number (12855638).

Almost surely, 2^66351664 is an apocalyptic number.

It is an amenable number.

66351664 is a deficient number, since it is larger than the sum of its proper divisors (62204716).

66351664 is a wasteful number, since it uses less digits than its factorization.

66351664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4146987 (or 4146981 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

The square root of 66351664 is about 8145.6530738793. The cubic root of 66351664 is about 404.8404879124.

The spelling of 66351664 in words is "sixty-six million, three hundred fifty-one thousand, six hundred sixty-four".