66644007 has 8 divisors (see below), whose sum is σ = 88902000. Its totient is φ = 44407680.

The previous prime is 66643933. The next prime is 66644033. The reversal of 66644007 is 70044666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66644007 - 2¹⁵ = 66611239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66644057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4207 + ... + 12287.

It is an arithmetic number, because the mean of its divisors is an integer number (11112750).

Almost surely, 2^66644007 is an apocalyptic number.

66644007 is a deficient number, since it is larger than the sum of its proper divisors (22257993).

66644007 is a wasteful number, since it uses less digits than its factorization.

66644007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10833.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 66644007 is about 8163.5780758195. The cubic root of 66644007 is about 405.4341876090.

The spelling of 66644007 in words is "sixty-six million, six hundred forty-four thousand, seven".