66606073715 has 4 divisors (see below), whose sum is σ = 79927288464. Its totient is φ = 53284858968.

The previous prime is 66606073687. The next prime is 66606073817. The reversal of 66606073715 is 51737060666.

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 66606073715 - 2¹² = 66606069619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66606073715.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6660607367 + ... + 6660607376.

It is an arithmetic number, because the mean of its divisors is an integer number (19981822116).

Almost surely, 2^66606073715 is an apocalyptic number.

66606073715 is a deficient number, since it is larger than the sum of its proper divisors (13321214749).

66606073715 is a wasteful number, since it uses less digits than its factorization.

66606073715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13321214748.

The product of its (nonzero) digits is 952560, while the sum is 47.

The spelling of 66606073715 in words is "sixty-six billion, six hundred six million, seventy-three thousand, seven hundred fifteen".