660000066480 has 120 divisors (see below), whose sum is σ = 2218428725760. Its totient is φ = 175846886400.

The previous prime is 660000066461. The next prime is 660000066493. The reversal of 660000066480 is 84660000066.

660000066480 is a `hidden beast` number, since 6 + 6 + 0 + 0 + 0 + 0 + 0 + 6 + 648 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 430516 + ... + 1226924.

It is an arithmetic number, because the mean of its divisors is an integer number (18486906048).

Almost surely, 2^660000066480 is an apocalyptic number.

660000066480 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 660000066480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1109214362880).

660000066480 is an abundant number, since it is smaller than the sum of its proper divisors (1558428659280).

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

660000066480 is a wasteful number, since it uses less digits than its factorization.

660000066480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797579 (or 797570 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 660000066480 in words is "six hundred sixty billion, sixty-six thousand, four hundred eighty".