660511008 has 144 divisors (see below), whose sum is σ = 1930907160. Its totient is φ = 214106112.

The previous prime is 660510997. The next prime is 660511009. The reversal of 660511008 is 800115066.

It can be written as a sum of positive squares in 4 ways, for example, as 467078544 + 193432464 = 21612^2 + 13908^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660511009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1870960 + ... + 1871312.

Almost surely, 2^660511008 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 660511008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (965453580).

660511008 is an abundant number, since it is smaller than the sum of its proper divisors (1270396152).

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

660511008 is a wasteful number, since it uses less digits than its factorization.

660511008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 660511008 is about 25700.4087127034. The cubic root of 660511008 is about 870.8834149861.

The spelling of 660511008 in words is "six hundred sixty million, five hundred eleven thousand, eight".