665811706630 has 128 divisors (see below), whose sum is σ = 1430400061440. Its totient is φ = 218383672320.

The previous prime is 665811706621. The next prime is 665811706639. The reversal of 665811706630 is 36607118566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (665811706621) and next prime (665811706639).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665811706639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 62576851 + ... + 62587489.

It is an arithmetic number, because the mean of its divisors is an integer number (11175000480).

Almost surely, 2^665811706630 is an apocalyptic number.

665811706630 is an abundant number, since it is smaller than the sum of its proper divisors (764588354810).

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

665811706630 is a wasteful number, since it uses less digits than its factorization.

665811706630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11094.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 665811706630 in words is "six hundred sixty-five billion, eight hundred eleven million, seven hundred six thousand, six hundred thirty".