996216660 has 144 divisors (see below), whose sum is σ = 3211790400. Its totient is φ = 249080832.

The previous prime is 996216649. The next prime is 996216707. The reversal of 996216660 is 66612699.

996216660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1159311 + ... + 1160169.

It is an arithmetic number, because the mean of its divisors is an integer number (22304100).

Almost surely, 2^996216660 is an apocalyptic number.

996216660 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 996216660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1605895200).

996216660 is an abundant number, since it is smaller than the sum of its proper divisors (2215573740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

996216660 is a wasteful number, since it uses less digits than its factorization.

996216660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270 (or 1265 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 996216660 is about 31562.9000568706. The cubic root of 996216660 is about 998.7372929086.

The spelling of 996216660 in words is "nine hundred ninety-six million, two hundred sixteen thousand, six hundred sixty".