666500784468 has 24 divisors (see below), whose sum is σ = 1570566207840. Its totient is φ = 219967255200.

The previous prime is 666500784463. The next prime is 666500784479. The reversal of 666500784468 is 864487005666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666500784463) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 274957858 + ... + 274960281.

It is an arithmetic number, because the mean of its divisors is an integer number (65440258660).

Almost surely, 2^666500784468 is an apocalyptic number.

It is an amenable number.

666500784468 is an abundant number, since it is smaller than the sum of its proper divisors (904065423372).

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

666500784468 is a wasteful number, since it uses less digits than its factorization.

666500784468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549918247 (or 549918245 counting only the distinct ones).

The product of its (nonzero) digits is 46448640, while the sum is 60.

The spelling of 666500784468 in words is "six hundred sixty-six billion, five hundred million, seven hundred eighty-four thousand, four hundred sixty-eight".