66256772 has 6 divisors (see below), whose sum is σ = 115949358. Its totient is φ = 33128384.

The previous prime is 66256741. The next prime is 66256777. The reversal of 66256772 is 27765266.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 49084036 + 17172736 = 7006^2 + 4144^2 .

It is not an unprimeable number, because it can be changed into a prime (66256777) 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 as a sum of consecutive naturals, namely, 8282093 + ... + 8282100.

It is an arithmetic number, because the mean of its divisors is an integer number (19324893).

Almost surely, 2^66256772 is an apocalyptic number.

It is an amenable number.

66256772 is a deficient number, since it is larger than the sum of its proper divisors (49692586).

66256772 is a wasteful number, since it uses less digits than its factorization.

66256772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16564197 (or 16564195 counting only the distinct ones).

The product of its digits is 211680, while the sum is 41.

The square root of 66256772 is about 8139.8262880727. The cubic root of 66256772 is about 404.6474033220.

The spelling of 66256772 in words is "sixty-six million, two hundred fifty-six thousand, seven hundred seventy-two".