128166939943 has 16 divisors (see below), whose sum is σ = 150263930880. Its totient is φ = 107037772416.

The previous prime is 128166939941. The next prime is 128166939947. The reversal of 128166939943 is 349939661821.

It is a cyclic number.

It is not a de Polignac number, because 128166939943 - 2¹ = 128166939941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128166939941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 800098 + ... + 946831.

It is an arithmetic number, because the mean of its divisors is an integer number (9391495680).

Almost surely, 2^128166939943 is an apocalyptic number.

128166939943 is a deficient number, since it is larger than the sum of its proper divisors (22096990937).

128166939943 is a wasteful number, since it uses less digits than its factorization.

128166939943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747206.

The product of its digits is 15116544, while the sum is 61.

The spelling of 128166939943 in words is "one hundred twenty-eight billion, one hundred sixty-six million, nine hundred thirty-nine thousand, nine hundred forty-three".