128851225105 has 4 divisors (see below), whose sum is σ = 154621470132. Its totient is φ = 103080980080.

The previous prime is 128851225073. The next prime is 128851225157. The reversal of 128851225105 is 501522158821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 501522158821 = 149 ⋅3365920529.

It can be written as a sum of positive squares in 2 ways, for example, as 33918220561 + 94933004544 = 184169^2 + 308112^2 .

It is not a de Polignac number, because 128851225105 - 2⁵ = 128851225073 is a prime.

It is a super-2 number, since 2×128851225105² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12885122506 + ... + 12885122515.

It is an arithmetic number, because the mean of its divisors is an integer number (38655367533).

Almost surely, 2^128851225105 is an apocalyptic number.

It is an amenable number.

128851225105 is a deficient number, since it is larger than the sum of its proper divisors (25770245027).

128851225105 is an equidigital number, since it uses as much as digits as its factorization.

128851225105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25770245026.

The product of its (nonzero) digits is 64000, while the sum is 40.

The spelling of 128851225105 in words is "one hundred twenty-eight billion, eight hundred fifty-one million, two hundred twenty-five thousand, one hundred five".