128166956823 has 8 divisors (see below), whose sum is σ = 170892342000. Its totient is φ = 85443104768.

The previous prime is 128166956821. The next prime is 128166956839. The reversal of 128166956823 is 328659661821.

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

It is a cyclic number.

It is not a de Polignac number, because 128166956823 - 2¹ = 128166956821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128166956821) 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, 171498 + ... + 534551.

It is an arithmetic number, because the mean of its divisors is an integer number (21361542750).

Almost surely, 2^128166956823 is an apocalyptic number.

128166956823 is a deficient number, since it is larger than the sum of its proper divisors (42725385177).

128166956823 is an equidigital number, since it uses as much as digits as its factorization.

128166956823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766561.

The product of its digits is 7464960, while the sum is 57.

The spelling of 128166956823 in words is "one hundred twenty-eight billion, one hundred sixty-six million, nine hundred fifty-six thousand, eight hundred twenty-three".