3965321566 has 4 divisors (see below), whose sum is σ = 5947982352. Its totient is φ = 1982660782.

The previous prime is 3965321551. The next prime is 3965321609. The reversal of 3965321566 is 6651235693.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 991330390 + ... + 991330393.

It is an arithmetic number, because the mean of its divisors is an integer number (1486995588).

Almost surely, 2^3965321566 is an apocalyptic number.

3965321566 is a deficient number, since it is larger than the sum of its proper divisors (1982660786).

3965321566 is a wasteful number, since it uses less digits than its factorization.

3965321566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982660785.

The product of its digits is 874800, while the sum is 46.

The square root of 3965321566 is about 62970.7993120621. The cubic root of 3965321566 is about 1582.8003489261.

The spelling of 3965321566 in words is "three billion, nine hundred sixty-five million, three hundred twenty-one thousand, five hundred sixty-six".