660473660 has 144 divisors (see below), whose sum is σ = 1761779712. Its totient is φ = 203575680.

The previous prime is 660473629. The next prime is 660473689. The reversal of 660473660 is 66374066.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2151227 + ... + 2151533.

Almost surely, 2^660473660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660473660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (880889856).

660473660 is an abundant number, since it is smaller than the sum of its proper divisors (1101306052).

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

660473660 is a wasteful number, since it uses less digits than its factorization.

660473660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 459 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 38.

The square root of 660473660 is about 25699.6820992011. The cubic root of 660473660 is about 870.8670002373.

The spelling of 660473660 in words is "six hundred sixty million, four hundred seventy-three thousand, six hundred sixty".