66601004 has 12 divisors (see below), whose sum is σ = 122686200. Its totient is φ = 31547808.

The previous prime is 66600991. The next prime is 66601009. The reversal of 66601004 is 40010666.

It is not an unprimeable number, because it can be changed into a prime (66601009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438089 + ... + 438240.

It is an arithmetic number, because the mean of its divisors is an integer number (10223850).

Almost surely, 2^66601004 is an apocalyptic number.

It is an amenable number.

66601004 is a deficient number, since it is larger than the sum of its proper divisors (56085196).

66601004 is a wasteful number, since it uses less digits than its factorization.

66601004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876352 (or 876350 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 66601004 is about 8160.9438179662. The cubic root of 66601004 is about 405.3469647737.

The spelling of 66601004 in words is "sixty-six million, six hundred one thousand, four".