666665443332 has 120 divisors (see below), whose sum is σ = 1992392001600. Its totient is φ = 190415966400.

The previous prime is 666665443267. The next prime is 666665443361. The reversal of 666665443332 is 233344566666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7437582 + ... + 7526682.

It is an arithmetic number, because the mean of its divisors is an integer number (16603266680).

Almost surely, 2^666665443332 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 666665443332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (996196000800).

666665443332 is an abundant number, since it is smaller than the sum of its proper divisors (1325726558268).

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

666665443332 is a wasteful number, since it uses less digits than its factorization.

666665443332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92423 (or 92412 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 54.

The spelling of 666665443332 in words is "six hundred sixty-six billion, six hundred sixty-five million, four hundred forty-three thousand, three hundred thirty-two".