66580648 has 8 divisors (see below), whose sum is σ = 124838730. Its totient is φ = 33290320.

The previous prime is 66580627. The next prime is 66580663. The reversal of 66580648 is 84608566.

It can be written as a sum of positive squares in only one way, i.e., 49589764 + 16990884 = 7042^2 + 4122^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4161283 + ... + 4161298.

Almost surely, 2^66580648 is an apocalyptic number.

It is an amenable number.

66580648 is a deficient number, since it is larger than the sum of its proper divisors (58258082).

66580648 is a wasteful number, since it uses less digits than its factorization.

66580648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8322587 (or 8322583 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 66580648 is about 8159.6965629857. The cubic root of 66580648 is about 405.3056636766.

The spelling of 66580648 in words is "sixty-six million, five hundred eighty thousand, six hundred forty-eight".