128006492161 has 4 divisors (see below), whose sum is σ = 128064494592. Its totient is φ = 127948489732.

The previous prime is 128006492123. The next prime is 128006492191. The reversal of 128006492161 is 161294600821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128006492161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128006492191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28997905 + ... + 29002318.

It is an arithmetic number, because the mean of its divisors is an integer number (32016123648).

Almost surely, 2^128006492161 is an apocalyptic number.

It is an amenable number.

128006492161 is a deficient number, since it is larger than the sum of its proper divisors (58002431).

128006492161 is an equidigital number, since it uses as much as digits as its factorization.

128006492161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58002430.

The product of its (nonzero) digits is 41472, while the sum is 40.

The spelling of 128006492161 in words is "one hundred twenty-eight billion, six million, four hundred ninety-two thousand, one hundred sixty-one".