6661066540724 has 24 divisors (see below), whose sum is σ = 12342836003400. Its totient is φ = 3134550588416.

The previous prime is 6661066540637. The next prime is 6661066540771. The reversal of 6661066540724 is 4270456601666.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3653679331600 + 3007387209124 = 1911460^2 + 1734182^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2104802 + ... + 4213350.

It is an arithmetic number, because the mean of its divisors is an integer number (514284833475).

Almost surely, 2^{6661066540724} is an apocalyptic number.

It is an amenable number.

6661066540724 is a deficient number, since it is larger than the sum of its proper divisors (5681769462676).

6661066540724 is a wasteful number, since it uses less digits than its factorization.

6661066540724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155027 (or 2155025 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 53.

The spelling of 6661066540724 in words is "six trillion, six hundred sixty-one billion, sixty-six million, five hundred forty thousand, seven hundred twenty-four".