665985611130 has 512 divisors, whose sum is σ = 1995115069440. Its totient is φ = 138936591360.

The previous prime is 665985611113. The next prime is 665985611143. The reversal of 665985611130 is 31116589566.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 3849627724 + ... + 3849627896.

It is an arithmetic number, because the mean of its divisors is an integer number (3896709120).

Almost surely, 2^665985611130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665985611130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (997557534720).

665985611130 is an abundant number, since it is smaller than the sum of its proper divisors (1329129458310).

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

665985611130 is a wasteful number, since it uses less digits than its factorization.

665985611130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514.

The product of its (nonzero) digits is 1166400, while the sum is 51.

The spelling of 665985611130 in words is "six hundred sixty-five billion, nine hundred eighty-five million, six hundred eleven thousand, one hundred thirty".