665113500 has 144 divisors (see below), whose sum is σ = 2133488448. Its totient is φ = 174384000.

The previous prime is 665113481. The next prime is 665113507. The reversal of 665113500 is 5311566.

It is a happy number.

665113500 is a `hidden beast` number, since 6 + 651 + 1 + 3 + 5 + 0 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665113507) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 273289 + ... + 275711.

It is an arithmetic number, because the mean of its divisors is an integer number (14815892).

Almost surely, 2^665113500 is an apocalyptic number.

665113500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665113500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1066744224).

665113500 is an abundant number, since it is smaller than the sum of its proper divisors (1468374948).

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

665113500 is a wasteful number, since it uses less digits than its factorization.

665113500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509 (or 2494 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 665113500 is about 25789.7944931711. The cubic root of 665113500 is about 872.9015291837.

The spelling of 665113500 in words is "six hundred sixty-five million, one hundred thirteen thousand, five hundred".