2689763666 has 4 divisors (see below), whose sum is σ = 4034645502. Its totient is φ = 1344881832.

The previous prime is 2689763627. The next prime is 2689763669. The reversal of 2689763666 is 6663679862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2471581225 + 218182441 = 49715^2 + 14771^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2689763669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672440915 + ... + 672440918.

Almost surely, 2^2689763666 is an apocalyptic number.

2689763666 is a deficient number, since it is larger than the sum of its proper divisors (1344881836).

2689763666 is a wasteful number, since it uses less digits than its factorization.

2689763666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344881835.

The product of its digits is 23514624, while the sum is 59.

The square root of 2689763666 is about 51862.9315214634. The cubic root of 2689763666 is about 1390.7146862132.

The spelling of 2689763666 in words is "two billion, six hundred eighty-nine million, seven hundred sixty-three thousand, six hundred sixty-six".