66566647412 has 12 divisors (see below), whose sum is σ = 116720500260. Its totient is φ = 33217933056.

The previous prime is 66566647333. The next prime is 66566647429. The reversal of 66566647412 is 21474666566.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 61002084196 + 5564563216 = 246986^2 + 74596^2 .

It is a super-2 number, since 2×66566647412² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16345373 + ... + 16349444.

It is an arithmetic number, because the mean of its divisors is an integer number (9726708355).

Almost surely, 2^66566647412 is an apocalyptic number.

It is an amenable number.

66566647412 is a deficient number, since it is larger than the sum of its proper divisors (50153852848).

66566647412 is a wasteful number, since it uses less digits than its factorization.

66566647412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32695330 (or 32695328 counting only the distinct ones).

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

The spelling of 66566647412 in words is "sixty-six billion, five hundred sixty-six million, six hundred forty-seven thousand, four hundred twelve".