71021666 has 8 divisors (see below), whose sum is σ = 106577004. Its totient is φ = 35496000.

The previous prime is 71021659. The next prime is 71021683. The reversal of 71021666 is 66612017.

It can be written as a sum of positive squares in 2 ways, for example, as 65141041 + 5880625 = 8071^2 + 2425^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86 + ... + 11918.

Almost surely, 2^71021666 is an apocalyptic number.

71021666 is a deficient number, since it is larger than the sum of its proper divisors (35555338).

71021666 is a wasteful number, since it uses less digits than its factorization.

71021666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14836.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 71021666 is about 8427.4353156818. The cubic root of 71021666 is about 414.1238903570.

The spelling of 71021666 in words is "seventy-one million, twenty-one thousand, six hundred sixty-six".