66919605 has 8 divisors (see below), whose sum is σ = 107071392. Its totient is φ = 35690448.

The previous prime is 66919583. The next prime is 66919613. The reversal of 66919605 is 50691966.

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

It is not a de Polignac number, because 66919605 - 2⁷ = 66919477 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2230639 + ... + 2230668.

It is an arithmetic number, because the mean of its divisors is an integer number (13383924).

Almost surely, 2^66919605 is an apocalyptic number.

It is an amenable number.

66919605 is a deficient number, since it is larger than the sum of its proper divisors (40151787).

66919605 is a wasteful number, since it uses less digits than its factorization.

66919605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4461315.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 66919605 is about 8180.4403915682. The cubic root of 66919605 is about 405.9922932039.

The spelling of 66919605 in words is "sixty-six million, nine hundred nineteen thousand, six hundred five".