66654843012 has 36 divisors (see below), whose sum is σ = 168554196720. Its totient is φ = 22209634992.

The previous prime is 66654843011. The next prime is 66654843043. The reversal of 66654843012 is 21034845666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (66654843011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 266118 + ... + 451805.

It is an arithmetic number, because the mean of its divisors is an integer number (4682061020).

Almost surely, 2^66654843012 is an apocalyptic number.

It is an amenable number.

66654843012 is an abundant number, since it is smaller than the sum of its proper divisors (101899353708).

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

66654843012 is a wasteful number, since it uses less digits than its factorization.

66654843012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720512 (or 720507 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 66654843012 in words is "sixty-six billion, six hundred fifty-four million, eight hundred forty-three thousand, twelve".