66696872130816 has 144 divisors (see below), whose sum is σ = 179681407301760. Its totient is φ = 21961528934400.

The previous prime is 66696872130797. The next prime is 66696872130853. The reversal of 66696872130816 is 61803127869666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30669390 + ... + 32772018.

Almost surely, 2^{66696872130816} 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 66696872130816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89840703650880).

66696872130816 is an abundant number, since it is smaller than the sum of its proper divisors (112984535170944).

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

66696872130816 is a wasteful number, since it uses less digits than its factorization.

66696872130816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103152 (or 2103138 counting only the distinct ones).

The product of its (nonzero) digits is 188116992, while the sum is 69.

The spelling of 66696872130816 in words is "sixty-six trillion, six hundred ninety-six billion, eight hundred seventy-two million, one hundred thirty thousand, eight hundred sixteen".