3775841666 has 4 divisors (see below), whose sum is σ = 5663762502. Its totient is φ = 1887920832.

The previous prime is 3775841639. The next prime is 3775841669. The reversal of 3775841666 is 6661485773.

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., 3116430625 + 659411041 = 55825^2 + 25679^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3775841669) by changing a digit.

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 as a sum of consecutive naturals, namely, 943960415 + ... + 943960418.

Almost surely, 2^3775841666 is an apocalyptic number.

3775841666 is a deficient number, since it is larger than the sum of its proper divisors (1887920836).

3775841666 is a wasteful number, since it uses less digits than its factorization.

3775841666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887920835.

The product of its digits is 5080320, while the sum is 53.

The square root of 3775841666 is about 61447.8776362536. The cubic root of 3775841666 is about 1557.1768007310.

The spelling of 3775841666 in words is "three billion, seven hundred seventy-five million, eight hundred forty-one thousand, six hundred sixty-six".