866650500 has 216 divisors, whose sum is σ = 2843884680. Its totient is φ = 222163200.

The previous prime is 866650493. The next prime is 866650501. The reversal of 866650500 is 5056668.

It can be written as a sum of positive squares in 12 ways, for example, as 371409984 + 495240516 = 19272^2 + 22254^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866650501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3784386 + ... + 3784614.

Almost surely, 2^866650500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866650500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1421942340).

866650500 is an abundant number, since it is smaller than the sum of its proper divisors (1977234180).

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

866650500 is a wasteful number, since it uses less digits than its factorization.

866650500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 866650500 is about 29438.9283092982. The cubic root of 866650500 is about 953.4135736440.

The spelling of 866650500 in words is "eight hundred sixty-six million, six hundred fifty thousand, five hundred".