66940850028 has 96 divisors (see below), whose sum is σ = 170741401600. Its totient is φ = 20288496384.

The previous prime is 66940849981. The next prime is 66940850143. The reversal of 66940850028 is 82005804966.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5404050 + ... + 5416422.

Almost surely, 2^66940850028 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 66940850028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85370700800).

66940850028 is an abundant number, since it is smaller than the sum of its proper divisors (103800551572).

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

66940850028 is a wasteful number, since it uses less digits than its factorization.

66940850028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12911 (or 12909 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 66940850028 in words is "sixty-six billion, nine hundred forty million, eight hundred fifty thousand, twenty-eight".