66806028205216 has 24 divisors (see below), whose sum is σ = 134583074265024. Its totient is φ = 32626199820480.

The previous prime is 66806028205211. The next prime is 66806028205219. The reversal of 66806028205216 is 61250282060866.

It is a happy number.

66806028205216 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 2×66806028205216² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66806028205211) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 24275444920 + ... + 24275447671.

It is an arithmetic number, because the mean of its divisors is an integer number (5607628094376).

Almost surely, 2^{66806028205216} is an apocalyptic number.

It is an amenable number.

66806028205216 is an abundant number, since it is smaller than the sum of its proper divisors (67777046059808).

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

66806028205216 is a wasteful number, since it uses less digits than its factorization.

66806028205216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48550892644 (or 48550892636 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 52.

The spelling of 66806028205216 in words is "sixty-six trillion, eight hundred six billion, twenty-eight million, two hundred five thousand, two hundred sixteen".