66706706740 has 12 divisors (see below), whose sum is σ = 140084084196. Its totient is φ = 26682682688.

The previous prime is 66706706711. The next prime is 66706706741. The reversal of 66706706740 is 4760760766.

It can be written as a sum of positive squares in 2 ways, for example, as 9548416656 + 57158290084 = 97716^2 + 239078^2 .

It is a super-2 number, since 2×66706706740² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66706706741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1667667649 + ... + 1667667688.

It is an arithmetic number, because the mean of its divisors is an integer number (11673673683).

Almost surely, 2^66706706740 is an apocalyptic number.

It is an amenable number.

66706706740 is an abundant number, since it is smaller than the sum of its proper divisors (73377377456).

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

66706706740 is a wasteful number, since it uses less digits than its factorization.

66706706740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3335335346 (or 3335335344 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 49.

The spelling of 66706706740 in words is "sixty-six billion, seven hundred six million, seven hundred six thousand, seven hundred forty".