6661656511016 has 48 divisors (see below), whose sum is σ = 13890880295100. Its totient is φ = 2991513088512.

The previous prime is 6661656511009. The next prime is 6661656511057. The reversal of 6661656511016 is 6101156561666.

It can be written as a sum of positive squares in 6 ways, for example, as 1234201014916 + 5427455496100 = 1110946^2 + 2329690^2 .

It is a super-2 number, since 2×6661656511016² (a number of 26 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

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 11 ways as a sum of consecutive naturals, for example, 66534581 + ... + 66634628.

Almost surely, 2^{6661656511016} is an apocalyptic number.

It is an amenable number.

6661656511016 is an abundant number, since it is smaller than the sum of its proper divisors (7229223784084).

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

6661656511016 is a wasteful number, since it uses less digits than its factorization.

6661656511016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133169278 (or 133169261 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 50.

The spelling of 6661656511016 in words is "six trillion, six hundred sixty-one billion, six hundred fifty-six million, five hundred eleven thousand, sixteen".