66010705 has 8 divisors (see below), whose sum is σ = 80707752. Its totient is φ = 51811968.

The previous prime is 66010691. The next prime is 66010709. The reversal of 66010705 is 50701066.

It can be written as a sum of positive squares in 4 ways, for example, as 11235904 + 54774801 = 3352^2 + 7401^2 .

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 66010705 - 2¹⁹ = 65486417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66010705.

It is not an unprimeable number, because it can be changed into a prime (66010709) 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 in 7 ways as a sum of consecutive naturals, for example, 124284 + ... + 124813.

It is an arithmetic number, because the mean of its divisors is an integer number (10088469).

Almost surely, 2^66010705 is an apocalyptic number.

It is an amenable number.

66010705 is a deficient number, since it is larger than the sum of its proper divisors (14697047).

66010705 is a wasteful number, since it uses less digits than its factorization.

66010705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249155.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 66010705 is about 8124.6972251278. The cubic root of 66010705 is about 404.1458501105.

The spelling of 66010705 in words is "sixty-six million, ten thousand, seven hundred five".