66701644 has 12 divisors (see below), whose sum is σ = 116991000. Its totient is φ = 33275648.

The previous prime is 66701641. The next prime is 66701651. The reversal of 66701644 is 44610766.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66701641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16774 + ... + 20365.

It is an arithmetic number, because the mean of its divisors is an integer number (9749250).

Almost surely, 2^66701644 is an apocalyptic number.

It is an amenable number.

66701644 is a deficient number, since it is larger than the sum of its proper divisors (50289356).

66701644 is a wasteful number, since it uses less digits than its factorization.

66701644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37592 (or 37590 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 66701644 is about 8167.1074438873. The cubic root of 66701644 is about 405.5510337090.

The spelling of 66701644 in words is "sixty-six million, seven hundred one thousand, six hundred forty-four".