66788166 has 8 divisors (see below), whose sum is σ = 133576344. Its totient is φ = 22262720.

The previous prime is 66788093. The next prime is 66788171. The reversal of 66788166 is 66188766.

It is a sphenic number, since it is the product of 3 distinct primes.

66788166 is an admirable number.

It is a congruent number.

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, 5565675 + ... + 5565686.

It is an arithmetic number, because the mean of its divisors is an integer number (16697043).

Almost surely, 2^66788166 is an apocalyptic number.

66788166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66788166 is a wasteful number, since it uses less digits than its factorization.

66788166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11131366.

The product of its digits is 580608, while the sum is 48.

The square root of 66788166 is about 8172.4027066708. The cubic root of 66788166 is about 405.7263113754.

The spelling of 66788166 in words is "sixty-six million, seven hundred eighty-eight thousand, one hundred sixty-six".