665931074116 has 135 divisors (see below), whose sum is σ = 1496334301917. Its totient is φ = 259110925920.

The previous prime is 665931074101. The next prime is 665931074117. The reversal of 665931074116 is 611470139566.

It is a happy number.

The square root of 665931074116 is 816046.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 411406788100 + 254524286016 = 641410^2 + 504504^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 665931074116.

It is not an unprimeable number, because it can be changed into a prime (665931074117) 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 44 ways as a sum of consecutive naturals, for example, 879697210 + ... + 879697966.

Almost surely, 2^665931074116 is an apocalyptic number.

665931074116 is the 816046-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665931074116

665931074116 is an abundant number, since it is smaller than the sum of its proper divisors (830403227801).

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

665931074116 is an frugal number, since it uses more digits than its factorization.

665931074116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 49.

Multiplying 665931074116 by its sum of digits (49), we get a square (32630622631684 = 5712322²).

665931074116 divided by its sum of digits (49) gives a square (13590430084 = 116578²).

The spelling of 665931074116 in words is "six hundred sixty-five billion, nine hundred thirty-one million, seventy-four thousand, one hundred sixteen".