2070689666 has 16 divisors (see below), whose sum is σ = 3198301848. Its totient is φ = 1004851200.

The previous prime is 2070689657. The next prime is 2070689681. The reversal of 2070689666 is 6669860702.

It can be written as a sum of positive squares in 4 ways, for example, as 421111441 + 1649578225 = 20521^2 + 40615^2 .

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, 49595 + ... + 81246.

Almost surely, 2^2070689666 is an apocalyptic number.

2070689666 is a deficient number, since it is larger than the sum of its proper divisors (1127612182).

2070689666 is a wasteful number, since it uses less digits than its factorization.

2070689666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131077.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The square root of 2070689666 is about 45504.8312380125. The cubic root of 2070689666 is about 1274.5934197136.

The spelling of 2070689666 in words is "two billion, seventy million, six hundred eighty-nine thousand, six hundred sixty-six".