66658857964160 has 256 divisors, whose sum is σ = 200726266164480. Its totient is φ = 20562591744000.

The previous prime is 66658857964151. The next prime is 66658857964213. The reversal of 66658857964160 is 6146975885666.

It is a super-3 number, since 3×66658857964160³ (a number of 42 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (77).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2192291 + ... + 11752610.

It is an arithmetic number, because the mean of its divisors is an integer number (784086977205).

Almost surely, 2^{66658857964160} 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 66658857964160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100363133082240).

66658857964160 is an abundant number, since it is smaller than the sum of its proper divisors (134067408200320).

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

66658857964160 is a wasteful number, since it uses less digits than its factorization.

66658857964160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13945035 (or 13945023 counting only the distinct ones).

The product of its (nonzero) digits is 3135283200, while the sum is 77.

The spelling of 66658857964160 in words is "sixty-six trillion, six hundred fifty-eight billion, eight hundred fifty-seven million, nine hundred sixty-four thousand, one hundred sixty".