66189906036 has 36 divisors (see below), whose sum is σ = 167372690212. Its totient is φ = 22055480064.

The previous prime is 66189905953. The next prime is 66189906059. The reversal of 66189906036 is 63060998166.

It can be written as a sum of positive squares in 2 ways, for example, as 47882192400 + 18307713636 = 218820^2 + 135306^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×66189906036² (a number of 22 digits) contains 22 as substring.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 222511 + ... + 426486.

Almost surely, 2^66189906036 is an apocalyptic number.

It is an amenable number.

66189906036 is an abundant number, since it is smaller than the sum of its proper divisors (101182784176).

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

66189906036 is a wasteful number, since it uses less digits than its factorization.

66189906036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651840 (or 651835 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The spelling of 66189906036 in words is "sixty-six billion, one hundred eighty-nine million, nine hundred six thousand, thirty-six".