128522074181 has 4 divisors (see below), whose sum is σ = 128540791500. Its totient is φ = 128503356864.

The previous prime is 128522074159. The next prime is 128522074183. The reversal of 128522074181 is 181470225821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7324792225 + 121197281956 = 85585^2 + 348134^2 .

It is a cyclic number.

It is not a de Polignac number, because 128522074181 - 2⁶ = 128522074117 is a prime.

It is a super-2 number, since 2×128522074181² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128522074183) 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, 9348356 + ... + 9362093.

It is an arithmetic number, because the mean of its divisors is an integer number (32135197875).

Almost surely, 2^128522074181 is an apocalyptic number.

It is an amenable number.

128522074181 is a deficient number, since it is larger than the sum of its proper divisors (18717319).

128522074181 is an equidigital number, since it uses as much as digits as its factorization.

128522074181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18717318.

The product of its (nonzero) digits is 71680, while the sum is 41.

The spelling of 128522074181 in words is "one hundred twenty-eight billion, five hundred twenty-two million, seventy-four thousand, one hundred eighty-one".