665941224216 has 32 divisors (see below), whose sum is σ = 1665317928960. Its totient is φ = 221918425632.

The previous prime is 665941224139. The next prime is 665941224241. The reversal of 665941224216 is 612422149566.

It is a super-2 number, since 2×665941224216² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3786120 + ... + 3958103.

It is an arithmetic number, because the mean of its divisors is an integer number (52041185280).

Almost surely, 2^665941224216 is an apocalyptic number.

It is an amenable number.

665941224216 is an abundant number, since it is smaller than the sum of its proper divisors (999376704744).

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

665941224216 is a wasteful number, since it uses less digits than its factorization.

665941224216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7747815 (or 7747811 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 48.

The spelling of 665941224216 in words is "six hundred sixty-five billion, nine hundred forty-one million, two hundred twenty-four thousand, two hundred sixteen".