66650312 has 8 divisors (see below), whose sum is σ = 124969350. Its totient is φ = 33325152.

The previous prime is 66650291. The next prime is 66650321. The reversal of 66650312 is 21305666.

It can be written as a sum of positive squares in only one way, i.e., 36554116 + 30096196 = 6046^2 + 5486^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4165637 + ... + 4165652.

Almost surely, 2^66650312 is an apocalyptic number.

It is an amenable number.

66650312 is a deficient number, since it is larger than the sum of its proper divisors (58319038).

66650312 is a wasteful number, since it uses less digits than its factorization.

66650312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8331295 (or 8331291 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 66650312 is about 8163.9642331407. The cubic root of 66650312 is about 405.4469728644.

Adding to 66650312 its reverse (21305666), we get a palindrome (87955978).

The spelling of 66650312 in words is "sixty-six million, six hundred fifty thousand, three hundred twelve".