66697327216 has 120 divisors (see below), whose sum is σ = 146170818080. Its totient is φ = 29305317888.

The previous prime is 66697327201. The next prime is 66697327237. The reversal of 66697327216 is 61272379666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25196005 + ... + 25198651.

Almost surely, 2^66697327216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66697327216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73085409040).

66697327216 is an abundant number, since it is smaller than the sum of its proper divisors (79473490864).

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

66697327216 is a wasteful number, since it uses less digits than its factorization.

66697327216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2943 (or 2914 counting only the distinct ones).

The product of its digits is 6858432, while the sum is 55.

The spelling of 66697327216 in words is "sixty-six billion, six hundred ninety-seven million, three hundred twenty-seven thousand, two hundred sixteen".