666515004 has 72 divisors (see below), whose sum is σ = 1663235280. Its totient is φ = 207486720.

The previous prime is 666514997. The next prime is 666515023. The reversal of 666515004 is 400515666.

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 23 ways as a sum of consecutive naturals, for example, 333432 + ... + 335424.

It is an arithmetic number, because the mean of its divisors is an integer number (23100490).

Almost surely, 2^666515004 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 666515004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (831617640).

666515004 is an abundant number, since it is smaller than the sum of its proper divisors (996720276).

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

666515004 is a wasteful number, since it uses less digits than its factorization.

666515004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2091 (or 2058 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 666515004 is about 25816.9518727521. The cubic root of 666515004 is about 873.5142149408.

The spelling of 666515004 in words is "six hundred sixty-six million, five hundred fifteen thousand, four".