666468929280 has 1296 divisors, whose sum is σ = 2765772227232. Its totient is φ = 136249344000.

The previous prime is 666468929257. The next prime is 666468929281. The reversal of 666468929280 is 82929864666.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666468929281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1662017080 + ... + 1662017480.

Almost surely, 2^666468929280 is an apocalyptic number.

666468929280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666468929280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1382886113616).

666468929280 is an abundant number, since it is smaller than the sum of its proper divisors (2099303297952).

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

666468929280 is a wasteful number, since it uses less digits than its factorization.

666468929280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 107495424, while the sum is 66.

The spelling of 666468929280 in words is "six hundred sixty-six billion, four hundred sixty-eight million, nine hundred twenty-nine thousand, two hundred eighty".