66061671216 has 80 divisors (see below), whose sum is σ = 179684332800. Its totient is φ = 20856593664.

The previous prime is 66061671211. The next prime is 66061671223. The reversal of 66061671216 is 61217616066.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66061671211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6441805 + ... + 6452051.

It is an arithmetic number, because the mean of its divisors is an integer number (2246054160).

Almost surely, 2^66061671216 is an apocalyptic number.

It is an amenable number.

66061671216 is an abundant number, since it is smaller than the sum of its proper divisors (113622661584).

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

66061671216 is a wasteful number, since it uses less digits than its factorization.

66061671216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17346 (or 17340 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 66061671216 in words is "sixty-six billion, sixty-one million, six hundred seventy-one thousand, two hundred sixteen".