666291480 has 64 divisors (see below), whose sum is σ = 2006402400. Its totient is φ = 177008640.

The previous prime is 666291473. The next prime is 666291497. The reversal of 666291480 is 84192666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21960 + ... + 42600.

Almost surely, 2^666291480 is an apocalyptic number.

666291480 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 666291480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1003201200).

666291480 is an abundant number, since it is smaller than the sum of its proper divisors (1340110920).

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

666291480 is a wasteful number, since it uses less digits than its factorization.

666291480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20924 (or 20920 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 666291480 is about 25812.6224936561. The cubic root of 666291480 is about 873.4165561130.

The spelling of 666291480 in words is "six hundred sixty-six million, two hundred ninety-one thousand, four hundred eighty".