666819402480 has 960 divisors, whose sum is σ = 2859965521920. Its totient is φ = 135215308800.

The previous prime is 666819402463. The next prime is 666819402511. The reversal of 666819402480 is 84204918666.

It is a congruent number.

It is an unprimeable number.

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 191 ways as a sum of consecutive naturals, for example, 672874785 + ... + 672875775.

It is an arithmetic number, because the mean of its divisors is an integer number (2979130752).

Almost surely, 2^666819402480 is an apocalyptic number.

666819402480 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 666819402480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1429982760960).

666819402480 is an abundant number, since it is smaller than the sum of its proper divisors (2193146119440).

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

666819402480 is a wasteful number, since it uses less digits than its factorization.

666819402480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310 (or 1301 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 666819402480 in words is "six hundred sixty-six billion, eight hundred nineteen million, four hundred two thousand, four hundred eighty".