666702878400 has 672 divisors, whose sum is σ = 2649050449920. Its totient is φ = 162122895360.

The previous prime is 666702878399. The next prime is 666702878407. The reversal of 666702878400 is 4878207666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (666702878407) 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 95 ways as a sum of consecutive naturals, for example, 46605649 + ... + 46619951.

It is an arithmetic number, because the mean of its divisors is an integer number (3942039360).

Almost surely, 2^666702878400 is an apocalyptic number.

666702878400 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 666702878400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1324525224960).

666702878400 is an abundant number, since it is smaller than the sum of its proper divisors (1982347571520).

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

666702878400 is a wasteful number, since it uses less digits than its factorization.

666702878400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14430 (or 14409 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 54.

The spelling of 666702878400 in words is "six hundred sixty-six billion, seven hundred two million, eight hundred seventy-eight thousand, four hundred".