66705572 has 6 divisors (see below), whose sum is σ = 116734758. Its totient is φ = 33352784.

The previous prime is 66705571. The next prime is 66705601. The reversal of 66705572 is 27550766.

It can be written as a sum of positive squares in only one way, i.e., 49928356 + 16777216 = 7066^2 + 4096^2 .

It is not an unprimeable number, because it can be changed into a prime (66705571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8338193 + ... + 8338200.

It is an arithmetic number, because the mean of its divisors is an integer number (19455793).

Almost surely, 2^66705572 is an apocalyptic number.

It is an amenable number.

66705572 is a deficient number, since it is larger than the sum of its proper divisors (50029186).

66705572 is a wasteful number, since it uses less digits than its factorization.

66705572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16676397 (or 16676395 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 38.

The square root of 66705572 is about 8167.3479171638. The cubic root of 66705572 is about 405.5589943983.

The spelling of 66705572 in words is "sixty-six million, seven hundred five thousand, five hundred seventy-two".