66611794 has 4 divisors (see below), whose sum is σ = 99917694. Its totient is φ = 33305896.

The previous prime is 66611789. The next prime is 66611813. The reversal of 66611794 is 49711666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49711666 = 2 ⋅24855833.

It can be written as a sum of positive squares in only one way, i.e., 64400625 + 2211169 = 8025^2 + 1487^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16652947 + ... + 16652950.

Almost surely, 2^66611794 is an apocalyptic number.

66611794 is a deficient number, since it is larger than the sum of its proper divisors (33305900).

66611794 is a wasteful number, since it uses less digits than its factorization.

66611794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33305899.

The product of its digits is 54432, while the sum is 40.

The square root of 66611794 is about 8161.6048666914. The cubic root of 66611794 is about 405.3688536207.

The spelling of 66611794 in words is "sixty-six million, six hundred eleven thousand, seven hundred ninety-four".