660116500 has 48 divisors (see below), whose sum is σ = 1444257360. Its totient is φ = 263577600.

The previous prime is 660116497. The next prime is 660116539. The reversal of 660116500 is 5611066.

It can be written as a sum of positive squares in 8 ways, for example, as 581581456 + 78535044 = 24116^2 + 8862^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 467796 + ... + 469204.

It is an arithmetic number, because the mean of its divisors is an integer number (30088695).

Almost surely, 2^660116500 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 660116500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (722128680).

660116500 is an abundant number, since it is smaller than the sum of its proper divisors (784140860).

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

660116500 is a wasteful number, since it uses less digits than its factorization.

660116500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365 (or 2353 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 660116500 is about 25692.7324354573. The cubic root of 660116500 is about 870.7099942583.

Adding to 660116500 its reverse (5611066), we get a palindrome (665727566).

The spelling of 660116500 in words is "six hundred sixty million, one hundred sixteen thousand, five hundred".