3961677866 has 4 divisors (see below), whose sum is σ = 5942516802. Its totient is φ = 1980838932.

The previous prime is 3961677857. The next prime is 3961677877. The reversal of 3961677866 is 6687761693.

It is a happy number.

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., 3893136025 + 68541841 = 62395^2 + 8279^2 .

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 as a sum of consecutive naturals, namely, 990419465 + ... + 990419468.

Almost surely, 2^3961677866 is an apocalyptic number.

3961677866 is a deficient number, since it is larger than the sum of its proper divisors (1980838936).

3961677866 is a wasteful number, since it uses less digits than its factorization.

3961677866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980838935.

The product of its digits is 13716864, while the sum is 59.

The square root of 3961677866 is about 62941.8609988615. The cubic root of 3961677866 is about 1582.3153931304.

The spelling of 3961677866 in words is "three billion, nine hundred sixty-one million, six hundred seventy-seven thousand, eight hundred sixty-six".