66772118 has 32 divisors (see below), whose sum is σ = 121271040. Its totient is φ = 26935200.

The previous prime is 66772117. The next prime is 66772157. The reversal of 66772118 is 81127766.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66772117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45293 + ... + 46743.

It is an arithmetic number, because the mean of its divisors is an integer number (3789720).

Almost surely, 2^66772118 is an apocalyptic number.

66772118 is a deficient number, since it is larger than the sum of its proper divisors (54498922).

66772118 is a wasteful number, since it uses less digits than its factorization.

66772118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652.

The product of its digits is 28224, while the sum is 38.

The square root of 66772118 is about 8171.4208066896. The cubic root of 66772118 is about 405.6938125172.

The spelling of 66772118 in words is "sixty-six million, seven hundred seventy-two thousand, one hundred eighteen".