128161620806 has 8 divisors (see below), whose sum is σ = 192246450840. Its totient is φ = 64079470528.

The previous prime is 128161620781. The next prime is 128161620889. The reversal of 128161620806 is 608026161821.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 545771 + ... + 744438.

It is an arithmetic number, because the mean of its divisors is an integer number (24030806355).

Almost surely, 2^128161620806 is an apocalyptic number.

128161620806 is a deficient number, since it is larger than the sum of its proper divisors (64084830034).

128161620806 is a wasteful number, since it uses less digits than its factorization.

128161620806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339878.

The product of its (nonzero) digits is 55296, while the sum is 41.

The spelling of 128161620806 in words is "one hundred twenty-eight billion, one hundred sixty-one million, six hundred twenty thousand, eight hundred six".