3221566321966 has 4 divisors (see below), whose sum is σ = 4832349482952. Its totient is φ = 1610783160982.

The previous prime is 3221566321937. The next prime is 3221566321973. The reversal of 3221566321966 is 6691236651223.

3221566321966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 805391580490 + ... + 805391580493.

It is an arithmetic number, because the mean of its divisors is an integer number (1208087370738).

Almost surely, 2^{3221566321966} is an apocalyptic number.

3221566321966 is a deficient number, since it is larger than the sum of its proper divisors (1610783160986).

3221566321966 is a wasteful number, since it uses less digits than its factorization.

3221566321966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610783160985.

The product of its digits is 4199040, while the sum is 52.

The spelling of 3221566321966 in words is "three trillion, two hundred twenty-one billion, five hundred sixty-six million, three hundred twenty-one thousand, nine hundred sixty-six".