66667950720 has 1280 divisors, whose sum is σ = 293672459520. Its totient is φ = 14067302400.

The previous prime is 66667950707. The next prime is 66667950731. The reversal of 66667950720 is 2705976666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 623064907 + ... + 623065013.

It is an arithmetic number, because the mean of its divisors is an integer number (229431609).

Almost surely, 2^66667950720 is an apocalyptic number.

66667950720 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 66667950720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146836229760).

66667950720 is an abundant number, since it is smaller than the sum of its proper divisors (227004508800).

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

66667950720 is a wasteful number, since it uses less digits than its factorization.

66667950720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 54.

The spelling of 66667950720 in words is "sixty-six billion, six hundred sixty-seven million, nine hundred fifty thousand, seven hundred twenty".