139643221766 has 16 divisors (see below), whose sum is σ = 215233956864. Its totient is φ = 67916797704.

The previous prime is 139643221763. The next prime is 139643221793. The reversal of 139643221766 is 667122346931.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139643221763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4541630 + ... + 4572273.

It is an arithmetic number, because the mean of its divisors is an integer number (13452122304).

Almost surely, 2^139643221766 is an apocalyptic number.

139643221766 is a deficient number, since it is larger than the sum of its proper divisors (75590735098).

139643221766 is a wasteful number, since it uses less digits than its factorization.

139643221766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9114115.

The product of its digits is 1959552, while the sum is 50.

The spelling of 139643221766 in words is "one hundred thirty-nine billion, six hundred forty-three million, two hundred twenty-one thousand, seven hundred sixty-six".