666615000 has 160 divisors (see below), whose sum is σ = 2193048000. Its totient is φ = 168336000.

The previous prime is 666614989. The next prime is 666615013. The reversal of 666615000 is 516666.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 283831 + ... + 286169.

It is an arithmetic number, because the mean of its divisors is an integer number (13706550).

Almost surely, 2^666615000 is an apocalyptic number.

666615000 is a gapful number since it is divisible by the number (60) 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 666615000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1096524000).

666615000 is an abundant number, since it is smaller than the sum of its proper divisors (1526433000).

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

666615000 is a wasteful number, since it uses less digits than its factorization.

666615000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2387 (or 2368 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 666615000 is about 25818.8884346325. Note that the first 3 decimals coincide. The cubic root of 666615000 is about 873.5578966579.

The spelling of 666615000 in words is "six hundred sixty-six million, six hundred fifteen thousand".