66607664 has 20 divisors (see below), whose sum is σ = 133503360. Its totient is φ = 32155200.

The previous prime is 66607633. The next prime is 66607679. The reversal of 66607664 is 46670666.

66607664 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 in 3 ways as a sum of consecutive naturals, for example, 71312 + ... + 72239.

It is an arithmetic number, because the mean of its divisors is an integer number (6675168).

Almost surely, 2^66607664 is an apocalyptic number.

It is an amenable number.

66607664 is an abundant number, since it is smaller than the sum of its proper divisors (66895696).

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

66607664 is a wasteful number, since it uses less digits than its factorization.

66607664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143588 (or 143582 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 66607664 is about 8161.3518488054. The cubic root of 66607664 is about 405.3604756851.

The spelling of 66607664 in words is "sixty-six million, six hundred seven thousand, six hundred sixty-four".