66818734850 has 72 divisors (see below), whose sum is σ = 146732104080. Its totient is φ = 22567295520.

The previous prime is 66818734847. The next prime is 66818734867. The reversal of 66818734850 is 5843781866.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 39380 + ... + 367679.

It is an arithmetic number, because the mean of its divisors is an integer number (2037945890).

Almost surely, 2^66818734850 is an apocalyptic number.

66818734850 is an abundant number, since it is smaller than the sum of its proper divisors (79913369230).

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

66818734850 is a wasteful number, since it uses less digits than its factorization.

66818734850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407152 (or 407140 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 56.

The spelling of 66818734850 in words is "sixty-six billion, eight hundred eighteen million, seven hundred thirty-four thousand, eight hundred fifty".