66213574160000 has 160 divisors (see below), whose sum is σ = 167944651211700. Its totient is φ = 25985702912000.

The previous prime is 66213574159973. The next prime is 66213574160047. The reversal of 66213574160000 is 6147531266.

It can be written as a sum of positive squares in 10 ways, for example, as 6896590290496 + 59316983869504 = 2626136^2 + 7701752^2 .

It is a tau number, because it is divible by the number of its divisors (160).

It is a self number, because there is not a number n which added to its sum of digits gives 66213574160000.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3568205 + ... + 12048204.

Almost surely, 2^{66213574160000} is an apocalyptic number.

It is an amenable number.

66213574160000 is an abundant number, since it is smaller than the sum of its proper divisors (101731077051700).

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

66213574160000 is an equidigital number, since it uses as much as digits as its factorization.

66213574160000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15616496 (or 15616469 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 66213574160000 in words is "sixty-six trillion, two hundred thirteen billion, five hundred seventy-four million, one hundred sixty thousand".