866220916 has 12 divisors (see below), whose sum is σ = 1653694560. Its totient is φ = 393736760.

The previous prime is 866220893. The next prime is 866220947. The reversal of 866220916 is 619022668.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9843376 + ... + 9843463.

It is an arithmetic number, because the mean of its divisors is an integer number (137807880).

Almost surely, 2^866220916 is an apocalyptic number.

It is an amenable number.

866220916 is a deficient number, since it is larger than the sum of its proper divisors (787473644).

866220916 is a wasteful number, since it uses less digits than its factorization.

866220916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19686854 (or 19686852 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 866220916 is about 29431.6312154118. The cubic root of 866220916 is about 953.2560172789.

The spelling of 866220916 in words is "eight hundred sixty-six million, two hundred twenty thousand, nine hundred sixteen".