666747480 has 128 divisors (see below), whose sum is σ = 2420513280. Its totient is φ = 143431680.

The previous prime is 666747479. The next prime is 666747503. The reversal of 666747480 is 84747666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9066 + ... + 37625.

It is an arithmetic number, because the mean of its divisors is an integer number (18910260).

Almost surely, 2^666747480 is an apocalyptic number.

666747480 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 666747480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1210256640).

666747480 is an abundant number, since it is smaller than the sum of its proper divisors (1753765800).

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

666747480 is a wasteful number, since it uses less digits than its factorization.

666747480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46729 (or 46725 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 48.

The square root of 666747480 is about 25821.4538707641. The cubic root of 666747480 is about 873.6157617847.

The spelling of 666747480 in words is "six hundred sixty-six million, seven hundred forty-seven thousand, four hundred eighty".