66810966012 has 72 divisors (see below), whose sum is σ = 199235592192. Its totient is φ = 18473076000.

The previous prime is 66810966011. The next prime is 66810966067. The reversal of 66810966012 is 21066901866.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66810966011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4268364 + ... + 4283987.

Almost surely, 2^66810966012 is an apocalyptic number.

66810966012 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

66810966012 is an abundant number, since it is smaller than the sum of its proper divisors (132424626180).

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

66810966012 is a wasteful number, since it uses less digits than its factorization.

66810966012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8552399 (or 8552394 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 66810966012 in words is "sixty-six billion, eight hundred ten million, nine hundred sixty-six thousand, twelve".