3871916866 has 4 divisors (see below), whose sum is σ = 5807875302. Its totient is φ = 1935958432.

The previous prime is 3871916819. The next prime is 3871916869. The reversal of 3871916866 is 6686191783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6686191783 = 17 ⋅393305399.

It can be written as a sum of positive squares in only one way, i.e., 3821094225 + 50822641 = 61815^2 + 7129^2 .

It is not an unprimeable number, because it can be changed into a prime (3871916869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 967979215 + ... + 967979218.

Almost surely, 2^3871916866 is an apocalyptic number.

3871916866 is a deficient number, since it is larger than the sum of its proper divisors (1935958436).

3871916866 is a wasteful number, since it uses less digits than its factorization.

3871916866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935958435.

The product of its digits is 2612736, while the sum is 55.

The square root of 3871916866 is about 62224.7287338402. The cubic root of 3871916866 is about 1570.2736437300.

The spelling of 3871916866 in words is "three billion, eight hundred seventy-one million, nine hundred sixteen thousand, eight hundred sixty-six".