666732996 has 144 divisors (see below), whose sum is σ = 1864332288. Its totient is φ = 199987200.

The previous prime is 666732959. The next prime is 666733003. The reversal of 666732996 is 699237666.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2143681 + ... + 2143991.

It is an arithmetic number, because the mean of its divisors is an integer number (12946752).

Almost surely, 2^666732996 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 666732996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (932166144).

666732996 is an abundant number, since it is smaller than the sum of its proper divisors (1197599292).

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

666732996 is a wasteful number, since it uses less digits than its factorization.

666732996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482 (or 477 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 54.

The square root of 666732996 is about 25821.1734047855. The cubic root of 666732996 is about 873.6094357804.

The spelling of 666732996 in words is "six hundred sixty-six million, seven hundred thirty-two thousand, nine hundred ninety-six".