955809666 has 256 divisors, whose sum is σ = 2786918400. Its totient is φ = 236307456.

The previous prime is 955809629. The next prime is 955809691. The reversal of 955809666 is 666908559.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 127 ways as a sum of consecutive naturals, for example, 4286031 + ... + 4286253.

It is an arithmetic number, because the mean of its divisors is an integer number (10886400).

Almost surely, 2^955809666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 955809666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1393459200).

955809666 is an abundant number, since it is smaller than the sum of its proper divisors (1831108734).

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

955809666 is a wasteful number, since it uses less digits than its factorization.

955809666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The square root of 955809666 is about 30916.1715935204. The cubic root of 955809666 is about 985.0474234857.

The spelling of 955809666 in words is "nine hundred fifty-five million, eight hundred nine thousand, six hundred sixty-six".