66628348939161 has 27 divisors (see below), whose sum is σ = 96395876148117. Its totient is φ = 44347509027000.

The previous prime is 66628348939129. The next prime is 66628348939169. The reversal of 66628348939161 is 16193984382666.

The square root of 66628348939161 is 8162619.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 66628348939161 - 2⁵ = 66628348939129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66628348939161.

It is not an unprimeable number, because it can be changed into a prime (66628348939169) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 18390378796 + ... + 18390382418.

Almost surely, 2^{66628348939161} is an apocalyptic number.

66628348939161 is the 8162619-th square number.

66628348939161 is the 4081310-th centered octagonal number.

It is an amenable number.

66628348939161 is a deficient number, since it is larger than the sum of its proper divisors (29767527208956).

66628348939161 is an frugal number, since it uses more digits than its factorization.

66628348939161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8754 (or 4377 counting only the distinct ones).

The product of its digits is 483729408, while the sum is 72.

The spelling of 66628348939161 in words is "sixty-six trillion, six hundred twenty-eight billion, three hundred forty-eight million, nine hundred thirty-nine thousand, one hundred sixty-one".