666548460 has 48 divisors (see below), whose sum is σ = 2073708000. Its totient is φ = 177746112.

The previous prime is 666548447. The next prime is 666548471. The reversal of 666548460 is 64845666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 616635 + ... + 617714.

It is an arithmetic number, because the mean of its divisors is an integer number (43202250).

Almost surely, 2^666548460 is an apocalyptic number.

666548460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666548460 is an abundant number, since it is smaller than the sum of its proper divisors (1407159540).

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

666548460 is a wasteful number, since it uses less digits than its factorization.

666548460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234367 (or 1234359 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The square root of 666548460 is about 25817.5998109817. The cubic root of 666548460 is about 873.5288301670.

The spelling of 666548460 in words is "six hundred sixty-six million, five hundred forty-eight thousand, four hundred sixty".