660646080 has 168 divisors, whose sum is σ = 2286146304. Its totient is φ = 175104000.

The previous prime is 660646073. The next prime is 660646097. The reversal of 660646080 is 80646066.

660646080 is a `hidden beast` number, since 6 + 6 + 0 + 646 + 0 + 8 + 0 = 666.

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 (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 549480 + ... + 550680.

Almost surely, 2^660646080 is an apocalyptic number.

660646080 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 660646080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1143073152).

660646080 is an abundant number, since it is smaller than the sum of its proper divisors (1625500224).

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

660646080 is a wasteful number, since it uses less digits than its factorization.

660646080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415 (or 1402 counting only the distinct ones).

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

The square root of 660646080 is about 25703.0363965038. The cubic root of 660646080 is about 870.9427750602.

The spelling of 660646080 in words is "six hundred sixty million, six hundred forty-six thousand, eighty".