66213571236 has 24 divisors (see below), whose sum is σ = 157785532800. Its totient is φ = 21601590432.

The previous prime is 66213571217. The next prime is 66213571271. The reversal of 66213571236 is 63217531266.

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 7 ways as a sum of consecutive naturals, for example, 58699411 + ... + 58700538.

It is an arithmetic number, because the mean of its divisors is an integer number (6574397200).

Almost surely, 2^66213571236 is an apocalyptic number.

It is an amenable number.

66213571236 is an abundant number, since it is smaller than the sum of its proper divisors (91571961564).

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

66213571236 is a wasteful number, since it uses less digits than its factorization.

66213571236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117400003 (or 117400001 counting only the distinct ones).

The product of its digits is 272160, while the sum is 42.

The spelling of 66213571236 in words is "sixty-six billion, two hundred thirteen million, five hundred seventy-one thousand, two hundred thirty-six".