66666703734068 has 6 divisors (see below), whose sum is σ = 116666731534626. Its totient is φ = 33333351867032.

The previous prime is 66666703734067. The next prime is 66666703734077. The reversal of 66666703734068 is 86043730766666.

It can be written as a sum of positive squares in only one way, i.e., 66240749100964 + 425954633104 = 8138842^2 + 652652^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66666703733989 and 66666703734007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666703734067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8333337966755 + ... + 8333337966762.

It is an arithmetic number, because the mean of its divisors is an integer number (19444455255771).

Almost surely, 2^{66666703734068} is an apocalyptic number.

It is an amenable number.

66666703734068 is a deficient number, since it is larger than the sum of its proper divisors (50000027800558).

66666703734068 is a wasteful number, since it uses less digits than its factorization.

66666703734068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16666675933521 (or 16666675933519 counting only the distinct ones).

The product of its (nonzero) digits is 658409472, while the sum is 68.

The spelling of 66666703734068 in words is "sixty-six trillion, six hundred sixty-six billion, seven hundred three million, seven hundred thirty-four thousand, sixty-eight".