666671699232 has 384 divisors, whose sum is σ = 2429964472320. Its totient is φ = 172754104320.

The previous prime is 666671699143. The next prime is 666671699257. The reversal of 666671699232 is 232996176666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 666671699232.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28795053 + ... + 28818195.

It is an arithmetic number, because the mean of its divisors is an integer number (6328032480).

Almost surely, 2^666671699232 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 666671699232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1214982236160).

666671699232 is an abundant number, since it is smaller than the sum of its proper divisors (1763292773088).

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

666671699232 is a wasteful number, since it uses less digits than its factorization.

666671699232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23613 (or 23599 counting only the distinct ones).

The product of its digits is 52907904, while the sum is 63.

The spelling of 666671699232 in words is "six hundred sixty-six billion, six hundred seventy-one million, six hundred ninety-nine thousand, two hundred thirty-two".