3961663766 has 4 divisors (see below), whose sum is σ = 5942495652. Its totient is φ = 1980831882.

The previous prime is 3961663753. The next prime is 3961663777. The reversal of 3961663766 is 6673661693.

It is a happy number.

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

It is a congruent number.

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, 990415940 + ... + 990415943.

It is an arithmetic number, because the mean of its divisors is an integer number (1485623913).

Almost surely, 2^3961663766 is an apocalyptic number.

3961663766 is a deficient number, since it is larger than the sum of its proper divisors (1980831886).

3961663766 is a wasteful number, since it uses less digits than its factorization.

3961663766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980831885.

The product of its digits is 4408992, while the sum is 53.

The square root of 3961663766 is about 62941.7489906342. The cubic root of 3961663766 is about 1582.3135159229.

The spelling of 3961663766 in words is "three billion, nine hundred sixty-one million, six hundred sixty-three thousand, seven hundred sixty-six".