66815195 has 8 divisors (see below), whose sum is σ = 80642736. Its totient is φ = 53142496.

The previous prime is 66815183. The next prime is 66815201. The reversal of 66815195 is 59151866.

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 66815195 - 2⁴ = 66815179 is a prime.

It is a Duffinian 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, 37757 + ... + 39486.

It is an arithmetic number, because the mean of its divisors is an integer number (10080342).

Almost surely, 2^66815195 is an apocalyptic number.

66815195 is a deficient number, since it is larger than the sum of its proper divisors (13827541).

66815195 is a wasteful number, since it uses less digits than its factorization.

66815195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77421.

The product of its digits is 64800, while the sum is 41.

The square root of 66815195 is about 8174.0562146342. The cubic root of 66815195 is about 405.7810361274.

The spelling of 66815195 in words is "sixty-six million, eight hundred fifteen thousand, one hundred ninety-five".