666238976 has 144 divisors (see below), whose sum is σ = 1585440864. Its totient is φ = 276824064.

The previous prime is 666238973. The next prime is 666238987. The reversal of 666238976 is 679832666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666238973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28966901 + ... + 28966923.

It is an arithmetic number, because the mean of its divisors is an integer number (11010006).

Almost surely, 2^666238976 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 666238976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (792720432).

666238976 is an abundant number, since it is smaller than the sum of its proper divisors (919201888).

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

666238976 is an equidigital number, since it uses as much as digits as its factorization.

666238976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 55 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 53.

The square root of 666238976 is about 25811.6054518118. The cubic root of 666238976 is about 873.3936136677.

The spelling of 666238976 in words is "six hundred sixty-six million, two hundred thirty-eight thousand, nine hundred seventy-six".