66810284368 has 10 divisors (see below), whose sum is σ = 129444925994. Its totient is φ = 33405142176.

The previous prime is 66810284323. The next prime is 66810284407. The reversal of 66810284368 is 86348201866.

It can be written as a sum of positive squares in only one way, i.e., 57711413824 + 9098870544 = 240232^2 + 95388^2 .

It is a super-2 number, since 2×66810284368² (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 as a sum of consecutive naturals, namely, 2087821371 + ... + 2087821402.

Almost surely, 2^66810284368 is an apocalyptic number.

It is an amenable number.

66810284368 is a deficient number, since it is larger than the sum of its proper divisors (62634641626).

66810284368 is a wasteful number, since it uses less digits than its factorization.

66810284368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4175642781 (or 4175642775 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 52.

The spelling of 66810284368 in words is "sixty-six billion, eight hundred ten million, two hundred eighty-four thousand, three hundred sixty-eight".