66710705 has 8 divisors (see below), whose sum is σ = 80102952. Its totient is φ = 53335168.

The previous prime is 66710671. The next prime is 66710717. The reversal of 66710705 is 50701766.

It can be written as a sum of positive squares in 4 ways, for example, as 10816 + 66699889 = 104^2 + 8167^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66710705 - 2¹⁴ = 66694321 is a prime.

It is a Duffinian 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 in 7 ways as a sum of consecutive naturals, for example, 7667 + ... + 13863.

It is an arithmetic number, because the mean of its divisors is an integer number (10012869).

Almost surely, 2^66710705 is an apocalyptic number.

It is an amenable number.

66710705 is a deficient number, since it is larger than the sum of its proper divisors (13392247).

66710705 is a wasteful number, since it uses less digits than its factorization.

66710705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8355.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 66710705 is about 8167.6621502117. The cubic root of 66710705 is about 405.5693967323.

The spelling of 66710705 in words is "sixty-six million, seven hundred ten thousand, seven hundred five".