66156320323216 has 20 divisors (see below), whose sum is σ = 132312640647424. Its totient is φ = 32011122736800.

The previous prime is 66156320323153. The next prime is 66156320323217. The reversal of 66156320323216 is 61232302365166.

66156320323216 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (66156320323217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66689838540 + ... + 66689839531.

Almost surely, 2^{66156320323216} is an apocalyptic number.

It is an amenable number.

66156320323216 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66156320323216 is a wasteful number, since it uses less digits than its factorization.

66156320323216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133379678110 (or 133379678104 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 46.

The spelling of 66156320323216 in words is "sixty-six trillion, one hundred fifty-six billion, three hundred twenty million, three hundred twenty-three thousand, two hundred sixteen".