666450190197792 has 4608 divisors, whose sum is σ = 2852007436615680. Its totient is φ = 146781418291200.

The previous prime is 666450190197769. The next prime is 666450190197817. The reversal of 666450190197792 is 297791091054666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 666450190197792.

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 767 ways as a sum of consecutive naturals, for example, 1458315514428 + ... + 1458315514884.

It is an arithmetic number, because the mean of its divisors is an integer number (618925224960).

Almost surely, 2^{666450190197792} 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 666450190197792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1426003718307840).

666450190197792 is an abundant number, since it is smaller than the sum of its proper divisors (2185557246417888).

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

666450190197792 is a wasteful number, since it uses less digits than its factorization.

666450190197792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733 (or 708 counting only the distinct ones).

The product of its (nonzero) digits is 308629440, while the sum is 72.

The spelling of 666450190197792 in words is "six hundred sixty-six trillion, four hundred fifty billion, one hundred ninety million, one hundred ninety-seven thousand, seven hundred ninety-two".