66610706 has 4 divisors (see below), whose sum is σ = 99916062. Its totient is φ = 33305352.

The previous prime is 66610697. The next prime is 66610717. The reversal of 66610706 is 60701666.

66610706 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, and also an emirpimes, since its reverse is a distinct semiprime: 60701666 = 2 ⋅30350833.

It can be written as a sum of positive squares in only one way, i.e., 65691025 + 919681 = 8105^2 + 959^2 .

It is a plaindrome in base 11.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 16652675 + ... + 16652678.

Almost surely, 2^66610706 is an apocalyptic number.

66610706 is a deficient number, since it is larger than the sum of its proper divisors (33305356).

66610706 is a wasteful number, since it uses less digits than its factorization.

66610706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33305355.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 66610706 is about 8161.5382128616. The cubic root of 66610706 is about 405.3666465856.

The spelling of 66610706 in words is "sixty-six million, six hundred ten thousand, seven hundred six".