66624645 has 8 divisors (see below), whose sum is σ = 106599456. Its totient is φ = 35533136.

The previous prime is 66624641. The next prime is 66624653. The reversal of 66624645 is 54642666.

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

It is a cyclic number.

It is not a de Polignac number, because 66624645 - 2² = 66624641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66624641) 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, 2220807 + ... + 2220836.

It is an arithmetic number, because the mean of its divisors is an integer number (13324932).

Almost surely, 2^66624645 is an apocalyptic number.

It is an amenable number.

66624645 is a deficient number, since it is larger than the sum of its proper divisors (39974811).

66624645 is a wasteful number, since it uses less digits than its factorization.

66624645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441651.

The product of its digits is 207360, while the sum is 39.

The square root of 66624645 is about 8162.3921126101. The cubic root of 66624645 is about 405.3949203769.

The spelling of 66624645 in words is "sixty-six million, six hundred twenty-four thousand, six hundred forty-five".