66275635878 has 192 divisors, whose sum is σ = 163782328320. Its totient is φ = 19258430400.

The previous prime is 66275635849. The next prime is 66275635883. The reversal of 66275635878 is 87853657266.

It is a happy number.

66275635878 is a `hidden beast` number, since 6 + 6 + 275 + 6 + 358 + 7 + 8 = 666.

It is a super-3 number, since 3×66275635878³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 46573875 + ... + 46575297.

It is an arithmetic number, because the mean of its divisors is an integer number (853032960).

Almost surely, 2^66275635878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66275635878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81891164160).

66275635878 is an abundant number, since it is smaller than the sum of its proper divisors (97506692442).

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

66275635878 is a wasteful number, since it uses less digits than its factorization.

66275635878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695 (or 1692 counting only the distinct ones).

The product of its digits is 101606400, while the sum is 63.

The spelling of 66275635878 in words is "sixty-six billion, two hundred seventy-five million, six hundred thirty-five thousand, eight hundred seventy-eight".