66516607 has 8 divisors (see below), whose sum is σ = 68964480. Its totient is φ = 64087680.

The previous prime is 66516589. The next prime is 66516613. The reversal of 66516607 is 70661566.

It is a happy number.

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 66516607 - 2¹¹ = 66514559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66516617) 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, 2619 + ... + 11827.

It is an arithmetic number, because the mean of its divisors is an integer number (8620560).

Almost surely, 2^66516607 is an apocalyptic number.

66516607 is a deficient number, since it is larger than the sum of its proper divisors (2447873).

66516607 is a wasteful number, since it uses less digits than its factorization.

66516607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9473.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 66516607 is about 8155.7713920879. The cubic root of 66516607 is about 405.1756734203.

The spelling of 66516607 in words is "sixty-six million, five hundred sixteen thousand, six hundred seven".