66271680310564 has 9 divisors (see below), whose sum is σ = 115975469036091. Its totient is φ = 33135832014540.

The previous prime is 66271680310547. The next prime is 66271680310571. The reversal of 66271680310564 is 46501308617266.

It is a happy number.

The square root of 66271680310564 is 8140742.

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

66271680310564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66271680310564² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14246299 + ... + 18316669.

Almost surely, 2^{66271680310564} is an apocalyptic number.

66271680310564 is the 8140742-nd square number.

It is an amenable number.

66271680310564 is a deficient number, since it is larger than the sum of its proper divisors (49703788725527).

66271680310564 is an frugal number, since it uses more digits than its factorization.

66271680310564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8140746 (or 4070373 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 66271680310564 in words is "sixty-six trillion, two hundred seventy-one billion, six hundred eighty million, three hundred ten thousand, five hundred sixty-four".