66843581612 has 24 divisors (see below), whose sum is σ = 118080362400. Its totient is φ = 33106496256.

The previous prime is 66843581569. The next prime is 66843581627. The reversal of 66843581612 is 21618534866.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1845089 + ... + 1880967.

It is an arithmetic number, because the mean of its divisors is an integer number (4920015100).

Almost surely, 2^66843581612 is an apocalyptic number.

It is an amenable number.

66843581612 is a deficient number, since it is larger than the sum of its proper divisors (51236780788).

66843581612 is a wasteful number, since it uses less digits than its factorization.

66843581612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40265 (or 40263 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 50.

The spelling of 66843581612 in words is "sixty-six billion, eight hundred forty-three million, five hundred eighty-one thousand, six hundred twelve".