666610472 has 128 divisors (see below), whose sum is σ = 1513209600. Its totient is φ = 272025600.

The previous prime is 666610471. The next prime is 666610487. The reversal of 666610472 is 274016666.

It is not an unprimeable number, because it can be changed into a prime (666610471) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 2406398 + ... + 2406674.

It is an arithmetic number, because the mean of its divisors is an integer number (11821950).

Almost surely, 2^666610472 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 666610472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (756604800).

666610472 is an abundant number, since it is smaller than the sum of its proper divisors (846599128).

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

666610472 is a wasteful number, since it uses less digits than its factorization.

666610472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 666610472 is about 25818.8007467427. The cubic root of 666610472 is about 873.5559187651. Note that the first 3 decimals are identical.

The spelling of 666610472 in words is "six hundred sixty-six million, six hundred ten thousand, four hundred seventy-two".