660553520 has 60 divisors (see below), whose sum is σ = 1688121120. Its totient is φ = 240197760.

The previous prime is 660553519. The next prime is 660553529. The reversal of 660553520 is 25355066.

It is not an unprimeable number, because it can be changed into a prime (660553529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24440 + ... + 43799.

It is an arithmetic number, because the mean of its divisors is an integer number (28135352).

Almost surely, 2^660553520 is an apocalyptic number.

It is an amenable number.

660553520 is an abundant number, since it is smaller than the sum of its proper divisors (1027567600).

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

660553520 is a wasteful number, since it uses less digits than its factorization.

660553520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68274 (or 68257 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 32.

The square root of 660553520 is about 25701.2357679548. The cubic root of 660553520 is about 870.9020986018.

The spelling of 660553520 in words is "six hundred sixty million, five hundred fifty-three thousand, five hundred twenty".