66885521394 has 8 divisors (see below), whose sum is σ = 133771042800. Its totient is φ = 22295173796.

The previous prime is 66885521347. The next prime is 66885521411. The reversal of 66885521394 is 49312558866.

It is a sphenic number, since it is the product of 3 distinct primes.

66885521394 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5573793444 + ... + 5573793455.

It is an arithmetic number, because the mean of its divisors is an integer number (16721380350).

Almost surely, 2^66885521394 is an apocalyptic number.

66885521394 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66885521394 is a wasteful number, since it uses less digits than its factorization.

66885521394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11147586904.

The product of its digits is 12441600, while the sum is 57.

The spelling of 66885521394 in words is "sixty-six billion, eight hundred eighty-five million, five hundred twenty-one thousand, three hundred ninety-four".