66799766 has 16 divisors (see below), whose sum is σ = 115739280. Its totient is φ = 28577280.

The previous prime is 66799753. The next prime is 66799771.

It is a happy number.

66799766 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88931 + ... + 89678.

It is an arithmetic number, because the mean of its divisors is an integer number (7233705).

Almost surely, 2^66799766 is an apocalyptic number.

66799766 is a deficient number, since it is larger than the sum of its proper divisors (48939514).

66799766 is a wasteful number, since it uses less digits than its factorization.

66799766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178639.

The product of its digits is 5143824, while the sum is 56.

The square root of 66799766 is about 8173.1123814615. The cubic root of 66799766 is about 405.7497993327.

The spelling of 66799766 in words is "sixty-six million, seven hundred ninety-nine thousand, seven hundred sixty-six".