66766772 has 6 divisors (see below), whose sum is σ = 116841858. Its totient is φ = 33383384.

The previous prime is 66766747. The next prime is 66766783. The reversal of 66766772 is 27766766.

It can be written as a sum of positive squares in only one way, i.e., 35473936 + 31292836 = 5956^2 + 5594^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 8345843 + ... + 8345850.

It is an arithmetic number, because the mean of its divisors is an integer number (19473643).

Almost surely, 2^66766772 is an apocalyptic number.

It is an amenable number.

66766772 is a deficient number, since it is larger than the sum of its proper divisors (50075086).

66766772 is a wasteful number, since it uses less digits than its factorization.

66766772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16691697 (or 16691695 counting only the distinct ones).

The product of its digits is 889056, while the sum is 47.

The square root of 66766772 is about 8171.0936844464. The cubic root of 66766772 is about 405.6829851586.

The spelling of 66766772 in words is "sixty-six million, seven hundred sixty-six thousand, seven hundred seventy-two".