66777222 has 8 divisors (see below), whose sum is σ = 133554456. Its totient is φ = 22259072.

The previous prime is 66777197. The next prime is 66777251. The reversal of 66777222 is 22277766.

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

66777222 is an admirable number.

It is a zygodrome in base 10.

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, 5564763 + ... + 5564774.

It is an arithmetic number, because the mean of its divisors is an integer number (16694307).

Almost surely, 2^66777222 is an apocalyptic number.

66777222 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.

66777222 is a wasteful number, since it uses less digits than its factorization.

66777222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11129542.

The product of its digits is 98784, while the sum is 39.

The square root of 66777222 is about 8171.7331087108. The cubic root of 66777222 is about 405.7041492093.

The spelling of 66777222 in words is "sixty-six million, seven hundred seventy-seven thousand, two hundred twenty-two".