660858560 has 56 divisors (see below), whose sum is σ = 1577461920. Its totient is φ = 263706624.

The previous prime is 660858521. The next prime is 660858581. The reversal of 660858560 is 65858066.

660858560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143981 + ... + 148499.

Almost surely, 2^660858560 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 660858560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (788730960).

660858560 is an abundant number, since it is smaller than the sum of its proper divisors (916603360).

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

660858560 is a wasteful number, since it uses less digits than its factorization.

660858560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4993 (or 4983 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 44.

The square root of 660858560 is about 25707.1694280020. The cubic root of 660858560 is about 871.0361372453.

The spelling of 660858560 in words is "six hundred sixty million, eight hundred fifty-eight thousand, five hundred sixty".