66199607 has 4 divisors (see below), whose sum is σ = 66233760. Its totient is φ = 66165456.

The previous prime is 66199603. The next prime is 66199621. The reversal of 66199607 is 70699166.

It is a happy number.

66199607 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66199607 - 2² = 66199603 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 (66199603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13982 + ... + 18107.

It is an arithmetic number, because the mean of its divisors is an integer number (16558440).

Almost surely, 2^66199607 is an apocalyptic number.

66199607 is a deficient number, since it is larger than the sum of its proper divisors (34153).

66199607 is a wasteful number, since it uses less digits than its factorization.

66199607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34152.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 66199607 is about 8136.3140917740. The cubic root of 66199607 is about 404.5309959782.

The spelling of 66199607 in words is "sixty-six million, one hundred ninety-nine thousand, six hundred seven".